Instrument Science Report NICMOS-018
NICMOS Paper Products: build 1
Luis Colina and Bill Sparks
February 5, 1997
ABSTRACT.
This report details the features of the NICMOS paper products produced by the HST data
pipeline. The requirements closely follow the design of paper products recommended by
the Data Quality Committee, although some changes were required to fully support NICMOS. Here we provide detailed design of build 1, with a subsequent build 2 anticipated.
1. Introduction
A routine part of the HST data is the post-calibration production of hardcopy products,
or ‘paper products’, that summarize the data obtained. The general problem of producing
these products was studied extensively by the Data Quality Committee and is described in
their report (Sparks, et al. 1995). These products are used for both informing the GO and
for data quality evaluation by the contact scientists. As such, the products must be general
enough to support both sets of users. This report describes in detail the requirements for
the paper products that summarize NICMOS data.
2. Description of NICMOS Paper Products
NICMOS paper products are designed to summarize a set of exposures. Typically, the
set of exposures will constitute one visit in an observing proposal. The individual pages in
the paper product either describe the details of a single exposure that can be an association
in the most general case. A given page in the NICMOS paper products falls into one of
two categories: visit-level page or exposure-level page. Below we list the individual pages,
the pages are described in detail in Section 3, “Page Generation and Layouts”.
1
Visit-level Pages
•
Cover Page
A cover page containing the proposal ID, the visit number, the PI’s name, and the proposal title.
•
Explanatory Notes
A set of notes explaining the paper products and the information they contain.
•
Target List
A table listing the targets in the set of observations being summarized.
•
Observation Summary
A table recapping the proposal information for each exposure for the set of observations being summarized including three processing and data quality flags.
•
Optional Parameters
A table listing the optional parameters, other than pattern related parameters, for the
set of observations being summarized.
•
Observing Pattern Strategy
A table listing the observing pattern for each exposure for the set of observations being
summarized.
Exposure-level Pages
•
Exposure Plots
A graphical representation of the data contained in each exposure including the final
calibrated science image and, in case of associations, successive pages contain a cartoon of the observing pattern plus the on-target and background individual images.
•
Data Quality Summary
A comprehensive summary of the spacecraft performance, pipeline processing status,
and calibration data quality for each exposure.
•
Calibration Reference File Summary
A summary of the calibration processing switches and reference files used to process
each exposure.
2
3
All
All
Calibration Files Page
PATTERN other than NONE or PATTERN equal
NONE and NUMITER>1
Association Images
Summary Page
All
All
Observing Pattern Strategy
Final Science Image
All
Optional Parameters Summary
OBSMODE equal to ACQ
All
Observation Summary
Conorograph Acq. Images
All
Target List
Exposure
All
Title Page
Visit
Production Criteria
Page Type
Summary Level
_cal and _mos
_trl and _jih
_mos, _asc and _cal
_mos, _asc and _cal
_cal
_raw
_raw
_raw and _jih and _trl
_raw and _spt
_raw and _spt
Filename Extension(s) Indicating Source
of Keywords and Data
Table 1: NICMOS Paper Products. Pages–Selection Criteria
3. Page Generation and Layouts
Table 1 summarizes the criteria for producing NICMOS paper products pages. The
table lists the individual page types followed by the criteria that trigger the creation of a
given page. For those pages that are always produced, the criterion is stated as “All”.
Additionally, the table lists the data files from which to extract the keyword and plot information. If no file can be found satisfying the selection criteria, a warning message is
produced by the paper products task.
Title Page
The Title Page consists of a Header, and four (4) keyword/value pairs. See Table 2 for
a description of the keyword-value pairs to be included on the Title Page. The visit and
title keywords are found in the _spt file. The proposal and PI name keywords are found in
the primary header of the _raw file. The keyword/value pairs are written in 20 point size.
See page 17 for an example of the title page.
Table 2: Title Page Keyword/Value Pairs
Found in Header
Keyword(s)
Print
Format
Proposal
PROPOSID
i4
Visit
OBSET_ID
i2
PI
PR_INV_L
PR_INV_F
c18
c18
Title
PROPTTL1
PROPTTL2
c68
c68
Label
Explanatory Notes
The Explanatory Notes page is an instruction sheet for using and understanding the
collection of NICMOS paper products pages. As this information describes the paper
products themselves, as opposed to the observations, this page does not change from visit
to visit. The section headers are written in bold font style. The headers in each section are
written in 12 point Narrow Helvetica Bold. The text in each section is written in 12 point
Times. See Page 18 for an example of the explanatory notes.
Target List
The Target List is a table containing target names, positions, and target descriptions.
The target name and description are derived from the proposal information. The positions
are the calculated positions based on processing of the proposal by the ground system.
4
Keywords for the target name and coordinates are found in the primary header of the _raw
file. The keyword for the description is found in the _spt file. See Table 3 for a description
of the keyword/value pairs to be included. See page 19 for an example of the target list
table.
Table 3: Target List Keyword/Value Pairs
Column
Name
Found in Header
Keyword
Print
Format
Target Name
TARGNAME
c30
RA (J2000)
RA_TARG
hh:mm:ss.ss
DEC (J2000)
DEC_TARG
ddd:mm:ss
Description
TARDESCR
TARDESC2
c68
c68
Observation Summary
The Observation Summary consists of the instrument configuration as downlinked
from the spacecraft in the science data stream. While the specification of the instrument
configuration uses proposal instruction language, wherever possible, actual rather than
predicted values are used. For associations, only the observation summary for the image
containing the target will be indicated here. The background images have the same
observing parameters. All keywords are found in the primary header of the _raw file. See
Table 4 for a description of the keyword/value pairs to be included. See page 19 for an
example of the observing summary table.
Table 4: Observation Summary Keyword/Value Pairs
Column Name
Found in Header
Keyword(s)
Print
Format
Visit-Exp #
PEP_EXPO
c15
Rootname
ROOTNAME
c9
Target Name
TARGNAME
c30
Camera Used/Prime
CAMERA
PRIMECAM
i1/i1
Operating Mode
OBSMODE
c10
Spectral Element
FILTER
c7
Pattern
PATTERN
c16
5
Found in Header
Keyword(s)
Print
Format
Exposure Time per
Iteration (sec)
EXPTIME
f8.3
Number Iterations
NUMITER
i3
OBS1
See “Data Quality Flags”
on page 6.
c1
PROC1
See “Data Quality Flags”
on page 6.
c1
CAL1
See “Data Quality Flags”
on page 6.
c1
Column Name
1These
three columns should be straddled by the column label: “Data Quality Flags”.
Data Quality Flags
OBS
The OBS quality flag summarizes as good or bad the spacecraft performance during
the execution of the observations as described by the OMS data. All information used in
determining the value of this flag comes from the _jih header file.
The flag should be set to UNKNOWN (represented by a blanck) when the _jih does
not exist..
The flag should be set to BAD (represented by a filled circle) if any one of the following conditions is true
•
TNRECENT > 0
•
TNLOSSES > 0
•
MV2_P2P > 0.06”
•
MV3_P2P > 0.06”
•
Any of the following keywords appears in the _jih header: T_ACQ2FL, T_GSFAIL,
T_TAPDRP, T_SLEWNG, T_TDFDWN, T_SISAFE, NO_SAM, NO_SLEW,
SD_LOST, FW_ERROR, SISUSPND.
The flag should be set to GOOD (represented by an open circle) otherwise.
PROC
The PROC quality flag summarizes as good or bad the pipeline processing status for
all of the individual processes that comprise the pipeline (e.g., data capture, data partitioning, generic conversion, science calibration, and data archiving). Problems during any
6
phase of pipeline processing results in messages being written to the _trl file. Thus, the _trl
file is dredged to look for messages to determine the status of the processing.
The flag should be set to UNKNOWN (represented by a blanck) when the _trl file does
not exist.
The flag should be set to BAD (represented by a filled circle) if the string “ERROR” is
found in the _trl file. Errors of this type are written by CALNICA and CALNICB, and
represent conditions that could result in the interruption of science calibration.
The flag should be set to GOOD (represented by an open circle) otherwise.
CAL
The CAL quality flag summarizes the quality of the calibration reference data used in
calibrating the observations. Problems with the calibrations are written to the _trl file by
CALNICA and CALNICB.
The flag should be set to UNKNOWN (represented by a blanck) when the _trl file does
not exist.
The flag should be set to bad (represented by a filled circle) if any of the following
conditions is true:
1. The string “DUMMY” appears in the _trl file
In the case of all calibration switches being set to “OMITTED”, the flag should
be set with the value of “NOT APPLICABLE” (represented by “N/A”).
The flag should be set to good (represented by an open circle) otherwise.
Optional Parameters Summary
The Optional Parameters summary consists of additional instrument configuration
items other than pattern related, which are specified in the proposal as optional parameters. As with the Observation Summary, the telemetry values are used rather than the
predicted ones. If an optional parameter was not set explicitly, the default value appears in
the summary. See Table 5 for a description of the keyword-value pairs to be included. All
keywords are found in the primary header of the _raw file.
Table 5: Optional Parameter Keyword/Value Pairs
Column Name
Found in Header
Keyword(s)
Print
Format
Visit-Exp #
PEP_EXPO
c15
7
Column Name
Found in Header
Keyword(s)
Print
Format
Rootname
ROOTNAME
c9
Target Name
TARGNAME
c30
Camera Used
CAMERA
i1
Operating Mode
OBSMODE
c10
Optional Parameters
See Table 6
The optional parameters are written as strings with the format: KEYWORD=VALUE
(i.e. NREAD=9). Since there can be multiple optional parameters for a given configuration/mode, multiple KEYWORD=VALUE strings are concatenated and separated with a
comma. Table 6 gives the rules for constructing the optional parameter value that appears
in the Optional Parameter Summary. The set of optional parameters to use is determined
from the values of the camera and operating mode, and are found in the primary header of
the _cal or _mos file. SAMP-SEQ and NSAMP will appear in the summary only when the
value for the keyword SAMP-SEQ is other than NONE. OFFSET will appear in the table
when the value for the keyword PATT_OFF is other than blank. See page 20 for an example of the optional parameters summary table.
Table 6: Optional Parameter Keyword/Value Pairs
CAMERA
OBSMODE
Optional Parameter
Header Keyword
Label
Print
Format
NIC1, NIC2, NIC3
ACCUM
NREAD
NREAD
i2
PATT_OFF
OFFSET
c12
SAMP-SEQ
SAMP-SEQ
c7
NSAMP
SAMPNUM
i2
PATT_OFF
OFFSET
c12
MULTIACCUM
Observing Pattern Strategy
The Observing Pattern Strategy summary consists of additional instrument configuration items which are specified in the proposal as optional parameters and give information
on the selected dithering/chopping strategy. See Table 7 for a description of the keywordvalue pairs to be included. All the keywords are found in the primary header of the _sci
8
file. If PATTERN=NONE, the rest of pattern related parameters, i.e. PORIENT, NUMPOS, DITHSIZE, and CHOPSIZE, should appear as “NON APPLICABLE”, i.e. indicated
by zeroes in the table. If PATTERN=SPIRAL-DITH, =SQUARE-WAVE-DITH,
=XSTRIP-DITH, or =YSTRIP-DITH, the optional parameter CHOPSIZE should be set to
zero. If PATTERN=ONE-CHOP, =TWO-CHOP, =FOUR-CHOP, or =EIGHT-CHOP,
the optional parameter DITHSIZE should be set to zero. For an example of the observing
pattern strategy summary table see page 20.
Table 7: Observing Pattern Strategy Keyword/Value Pairs
Column Name
Found in Header
Keyword(s)
Print
Format
Visit-Exp #
PEP_EXPO
c15
Rootname
ROOTNAME
c9
Target Name
TARGNAME
c30
Camera Used
CAMERA
i1
Operating Mode
OBSMODE
c10
Pattern Name
PATTERN
c16
Pattern Orient
PORIENT
f5.2
Number Positions
NUMPOS
i2
Dither Size
DITHSIZE
f6.2
Chop Size
CHOPSIZE
f6.2
Exposure Plots
Exposure Plot pages present two kinds of information: 1) descriptive information
taken from header keywords and 2) graphical representations of the data. See pages 21
through 23 and page 26 for examples of the exposure plots.
Exposure Plot Keywords
There are common sets of keywords used to describe different exposures as well as
keywords that are specific to a given instrument configuration and observing mode. We
have grouped keywords into sets to assist in the production of the NICMOS paper products. Three sets of keywords are common to all exposure plots: the OBS set describes the
observations, the TARGET set describes the target, and the IMAGING set describes the
exposure and is determined by the camera in use and the observing mode and type. See
9
previous section “Observing Pattern Strategy” for details on the values of the pattern
related optional parameters. Tables 8, 9 and 10 list all the sets of keywords. The values for
the plate scale will be 0.043”, 0.075”, and 0.20” for NIC1, NIC2, and NIC3 , respectively.
On the NICMOS Exposure Plot pages the groups of keywords appear in a vertical column on the right-hand side of the page. Within the column, groups are separated by a
single blank line.
Table 8: OBS Keyword/Value Pairs
Header
Keyword(s)
Print
Format
Rootname
ROOTNAME
c9
Obs. Date
DATE-OBS
c8
Obs. Time
TIME-OBS
c8
Label
Table 9: TARGET Keyword/Value Pairs
Header
Keyword(s)
Print
Format
Target Name
TARGNAME
c30
RA (J2000)
RA_TARG
hh:mm:ss.ss
DEC_TARG
ddd:mm:ss
Label
DEC (J2000)
Table 10: IMAGING Keyword/Value Pair
Header
Keyword(s)
Print
Format
Camera Used
CAMERA
i1
Prime Camera
PRIMECAM
i1
Aperture
APERTURE
c10
Observation Mode
OBSMODE
c10
Spectral Element
FILTER
c7
Exp Time per
Iteration
EXPTIME
f8.3
Number Iterations
NUMITER
i3
Label
10
Label
Image Size
Header
Keyword(s)
Print
Format
NAXIS1
NAXIS2
i4, i4
Plate Scale (“/pix)
f5.3
Image Orientation
ORIENTAT
f5.2
Pattern Name
PATTERN
c16
Pattern Orient
PORIENT
f5.2
Number Positions
NUMPOS
i2
Dither Size
DITHSIZE
f6.2
Chop Size
CHOPSIZE
f6.2
Exposure Plot Graphics
For operating modes other than ACQ, the end product of each exposure, i.e. calibrated
on-target image, will be presented on a grey scale linear plot in an arcsec scale, or in a
RA and DEC scale. To convert from (x,y) coordinates into arcsec, the zero order plate
scale (0.043”, 0.075”, and 0.20” for NIC1, NIC2 and NIC3, respectively) will be used.
These parameters are found in the extension headers of the _raw file.The position of the
target, as specified by the RA_TARG and DEC_TARG keywords, will also be indicated
(see page 20 for an example). For this purpose, the world coordinate system parameters
CRPIX1, CRPIX2, CRVAL1, CRVAL2, CD1_1, CD1_2, CD2_1, and CD2_2 will be
used. Additional information consists of: (1) a compass indicating the directions of North
and East if the arcsec scale is used; and (2) a rectangular bar showing the greyscale used
to display image both in count rate and flux. To convert the count rate into flux, the keyword PHOTFNU found in the primary header of the _mos or _cal files will be used.
For single ACCUM or MULTIACCUM images with more than one iteration (i.e. PATTERN=NONE, and NUMITER>1), there will be additional pages displaying each
individual exposure in a stamp size format (2.5 cm by 2.5 cm), and with a maximum of 50
plots per page.
For associations (i.e. PATTERN other than NONE) there will also be additional pages
with plots. The first of the additional pages will contain a cartoon of the observing pattern
(see NICMOS handbook pages 145-147 for similar cartoons) selected for the association,
as well as the on-target and the background image, in pixels. For the TWO_CHOP,
FOUR-CHOP and EIGHT-CHOP patterns, the background will be obtained as the average
of the two, four or eight independent background images obtained for the association. For
dithering-chopping associations, the mosaicked background image will be represented.
Information in the cartoon describing the pattern include the name of the pattern, the number of positions, and the dithering and/or chopping sizes. Additional pages will display
11
each of the individual exposures, i.e. number of positions (NUMPOS) times number of
iterations (NUMITER) per point, in a stamp size format (2.5 cm by 2.5 cm), and with a
maximum of 50 plots per page (see page 23 for an example).
For the ACQ operating mode, the two images calibrated using CALNICA will be
presented side by side on one page (see page 26 for an example).
Summary Page
The Summary Page gives the detailed data quality summary of the observation using
information extracted from the OMS products (_jih file), the trailer file (_trl) and keywords from the science header. This information formed the basis for the setting of the
data quality flags in the Observation Summary table. The page consists of four “areas” of
information which are described below. See page 24 for an example of the Summary Page.
The default value for the data quality “areas” of the Summary page is “File not available” whenever the _jih or _trl do not exist. If the status is good, the message written is
“No anomalies”. Error messages are described in detail in the following three sections.
HST Spacecraft Performance Summary
OMS keywords are used to provide the HST Performance Summary. The keyword/
value pairs are listed in Table 11. The presence of special OMS keywords in the _jih
header file result in information messages being written below the keyword/value pairs.
The special keywords are only written to OMS headers under unusual spacecraft performance. If special keywords exist, the messages listed in Table 12 should be included. All
keywords in Table 12 starting with a “T” are found in the primary header of the _jih file
whereas the rest are found in the extensions of the _jih file.
Table 11: OMS Keywords used to Populate HST Performance Status
Description
Header Keyword(s)
Print Format
# Recenterings
TNRECENT
i3
# Losses of Lock
TNLOSSES
i3
V2 Jitter (RMS)
TV2_RMS
f5.2
V2 Jitter (P2P)
MV2_P2P
f5.2
V3 Jitter (RMS)
TV3_RMS
f5.2
V3 Jitter (P2P)
MV3_P2P
f5.2
12
Table 12: OMS Special Keywords
Header Keywords
& Selection
Criteria
Print Format
Target acquisition failure
T_ACQ2FL=T
c50
Guide star acquisition failure
T_GSFAIL=T
c50
Possible loss of science data
T_TAPDRP
c50
Slewing occurred during this observation
T_SLEWNG=T
c50
Take data flag not on throughout observation
T_TDFDWN=F
c50
Obs. affected when science instrument safed
T_SISAFE=T
c50
Requested small angle maneuver rejected
NO_SAM=T
c50
Requested slew maneuver not executed
NO_SLEW=T
c50
Science data may be lost due to instrument error
SD_LOST=T
c50
Error occurred with filter wheel
FW_ERROR=T
c50
Instrument suspended during observation
SISUSPND=T
c50
Description
Pipeline Processing Summary
Errors that occur during pipeline processing are written to the trailer file (_trl). As
described in “Data Quality Flags”, error messages are searched for in the trailer file:
•
The string “ERROR” is found in the _trl file. Errors of this type are written by
CALNICA and CALNICB, and represent conditions that could result in the interruption of science calibration.
If any error messages are found, then the line containing the search string is written to
the Pipeline Processing “area” of the Summary Page.
Calibration Data Quality Summary
This section of the Summary Page is used to alert observers to the use of dummy or
fill-value calibration reference files in the pipeline calibration. If the string “DUMMY” is
dredged from the trailer file, then the line containing “DUMMY” is written to the Calibration Data Quality “area” of the Summary Page.
Keyword/Value Pairs
A set of keyword/value pairs identical to the ones included in the Exposure Plots pages
(see Tables 8, 9 and 10) is written to the right of the page in a column.
13
Calibration Status Summary
The Calibration Status Summary is a detailed description of calibration switches and
associated calibration reference files. Included in the description of the files is the pedigree
information. The switch value, reference file and pedigree information is filled from the
science header keywords as shown in the table below. The pedigree information must be
associated with the appropriate switches. Only those switch keywords that are present in
the header should be written to the Calibration Status Summary. Table 13 lists the calibrations switches, the text string that describes the switches and the applicable reference files
for each switch. The Calibration Status Summary includes all switches and files found in
the primary header of the _sci file. See page 25 for an example of the calibration status
summary.
Table 13: Calibration Switches and Reference File Keywords
Calibration
Reference
File
Calibration
Reference File
Pedigree
Wrapped pixel correction
N/A
N/A
ZOFFDONE
Substract MULTIACCUM zero read
N/A
N/A
MASKCORR
MASKDONE
Mask bad pixels
MASKFILE
MASKPDGR
NOISCALC
NOISDONE
Compute statistical
errors
NOISFILE
NOISPDGR
DARKCORR
DARKDONE
Dark subtraction
DARKFILE
DARKPDGR
NLINCORR
NLINDONE
Linearity correction
NLINFILE
NLINPDGR
FLATCORR
FLATDONE
Flat field correction
FLATFILE
FLATPDGR
UNITCORR
UNITDONE
Conversion to count
rates
N/A
N/A
PHOTCALC
PHOTDONE
Photometric calibration
PHOTTAB
PHOTPDGR
CRIDCALC
CRIDDONE
Identify cosmic rays hits
N/A
N/A
BACKCALC
BACKDONE
Predict background
BACKTAB
BACKPDGR
ILLMCORR
ILLMDONE
Substract background
illumination
ILLMFILE
IILMPDGR
WARNCALC
WARNDONE
Generate user warnings
N/A
N/A
Calibration
Switch
Calibration
Value
BIASCORR
BIASDONE
ZOFFCORR
Description
Additional Layout Notes
•
All pages for the NICMOS paper products are in landscape orientation.
14
•
The font used is Helvetica Narrow.
•
The character size used is 9 points for keyword-value pairs and 12 point for informational text or messages.
•
Margins will be 1.25 cm on all sides.
•
Keyword names used as labels are right justified and aligned and separated from the
left justified and aligned values by a colon. For example:
KEYWORD1:
VALUE1
KEYWORD2:
VALUE2
•
Table columns are left justified.
•
Information messages written to the Summary Page are left justified.
•
Numbers should be right justified.
•
Table rows are separated by a thin horizontal line.
•
The table header is separated from the table rows by a double set of thin horizontal
lines.
•
Column headers and table titles are in bold type–other text is in plain type.
•
Each page has a Header which consists of a rectangular box of dimensions 1.25 cm by
25.4 cm and is filled at (approximately) 30% grey. The text string “NICMOS” is right
justified within the box printed in 36 point Bold-Oblique font.
•
Headers for visit and exposure pages have the proposal id centered in the rectangular
header box. The format is “Proposal: 6789” and is written in 18 point font.
•
Headers for visit pages have the string “Visit: 01” left-justified in the header box and
written in 18 point font. The value for Visit is the value of the OBSET_ID keyword in
the science header file.
•
Headers for the exposure pages have the string “Visit-Exp#: 01-10” left-justified in the
header box and written in 18 point font. The value for Visit-Exp# is the value of the
PEP_EXPO keyword in the science header file.
•
If data from more than one visit or proposal is found in the input data, do not write the
visit or proposal number in the summary pages headers.
4. Enhancements for Build 2
•
Display mosaic and association data in detailed, correct geometry.
•
Create a cover page with the sky survey showing NICMOS apertures.
•
Display Grism data output from CALNICC.
•
Create new table with the visit and exposure level special requirements.
•
Engineering observing modes and optional parameters.
•
Future enhancements to be defined as we gain on orbit experience.
15
Acknowledgements
Steve Hulbert provided us with the FrameMaker version of the STIS paper products
instrument science report.
5. References
W.B. Sparks, D. Swade, S. Baum, S. Casertano, C. Cox, S. Hulbert, R.Jedrzejewski,
A. Koratkar, S. Parsons, M.A. Rose, K. Tittle. HST Paper Products: A Report by the
Data Quality Project. STScI, 1995.
16
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This Observing Pattern Strategy summarizes the optional parameters
used to specify the dithering/chopping pattern.
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The Optional Parameters Summary contains additional instrument
configuration information. Entries in the table reflect the values of the
Optional Parameters, other than pattern related, specified in the
observing proposal.
The Observation Summary contains information that uniquely identifies individual exposures as specified in the observing proposal.
Additionally, the status of the spacecraft and ground-system performance during the execution of the observation are summarized by the
Procedural Quality Flags:
OBS
Status of the performance of HST
PROC Status of the pipeline processing of the observations.
CAL
Status of the reference data used in calibration.
The symbols used to indicate the status of the Procedural Quality are:
❍
●
Not OK–Refer to the Data Quality Summary for details.
Blanck Status unknown.
Plots are created for each exposure. Grey-scale plots are produced as
appropriate for the instrument configuration and observing mode for
each exposure. Exposure information taken from the headers of the
data files is also provided. For associations using a chopping or dithering-chopping patterns, the mosaicked averaged background image
is also plotted. In the case of associations with several positions or
repeated observations in a single position, each individual observation is plotted in a stamp-size format. The position in the pattern will
be indicated at the left top of each plot. The number of repeated plots
per position indicates the requested number of iterations per pointing.
The Target List contains the target name, the coordinates for the target as calculated by the ground system based on the target information taken from the proposal, and the text description of the target
given in the proposal. Note that the coordinates listed represent the
predicted position of the target in the sky and do not give the pointing
of HST at the time of the observation.
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