PDS_VERSION_ID                  = PDS3
RECORD_TYPE                     = STREAM

DATA_SET_ID                     = "HST-S-WFPC2-3-RPX-V1.0"

OBJECT                          = TEXT
  PUBLICATION_DATE              = 1998-09-16
  NOTE                          = "Description of documentation files
provided on this volume."
END_OBJECT                      = TEXT
END

          DESCRIPTION OF DOCUMENTATION FILES ON THIS VOLUME
          -------------------------------------------------

The directory contains files that document the instruments,
experiments and file formats on this volume.  The files included are:

    DOCINFO.TXT  - This file.

    EZINDEX.TXT  - Contains a brief listing of all the files in this
                   data set.  Much more information can be found in
                   the files of the INDEX directory, but this file is
                   much more readable.

    FITS.TXT     - Contains a brief overview of the FITS file format.

    FITSDEFS.TXT - Contains brief descriptions of all the FITS
                   keywords used in the data files on this volume.

    FITSXREF.TXT - Contains a cross-reference table indicating which
                   FITS headers contain which keywords.

    FITSINFO.*   - A complete description of the FITS file standard,
                   in Postscript, LaTeX, and ASCII formats.  See
                   FITSINFO.LBL for an explanation of the other files.

    HSTDESC.HTM  - A description of the HST spacecraft.
    HSTDESC.LBL  - Detached PDS label for the above.

    HSTHB*.*     - Excerpts from the HST Data Handbook, as provided by
                   Space Telescope Science Institute.  Only those
                   sections relevant to WFPC2 data have been included.
                   This document is provided in Postscript and Adobe
                   Acrobat (PDF) formats.  See the label file
                   HSTHB.LBL for further details.

    PDSDD.TXT    - Excerpts from the PDS Data Dictionary, defining
                   every keyword appearing in the label for a data
                   file in this data set.

    PROPnnnn.TXT - HST proposal abstracts for all the HST observations
                   included in this data set.  The last four
                   characters are the numeric proposal ID.  The HST
                   proposal ID associated with any given file in this
                   data set is found inside the NOTE field of the
                   file's label.

    TUTORIAL.TXT - A tutorial about how to use this data set,
                   including a summary of how to determine the
                   geometry and calibration of these images.

    WFPC2*.*     - Version 4.0 of WFPC2 Instrument Handbook, as
                   provided by Space Telescope Science Institute.
                   This document is provided in Postscript and plain
                   ASCII text formats.  See the label file WFPC2.LBL
                   for further details.

    ZIPINFO.TXT  - A brief overview of the Zip file format used on
                   this volume.

NOTE REGARDING ASCII TEXT FILES

Different popular operating systems use different standards for how
ASCII text files are formatted.  On Unix systems, lines are terminated
by a <LF> (linefeed character, control-J, ASCII 10).  On Macintosh
computers, lines are terminated by a <CR> (carriage return character,
control-M, ASCII 13). On PCs, lines are terminated by a <CR><LF> pair.
PDS standards require all text files to use <CR><LF> line termination.
If the PDS label indicates INTERCHANGE_FORMAT = ASCII or RECORD_TYPE =
STREAM, then this line termination is in use.  In this directory, this
applies to all files except those in Adobe Acrobat format (*.PDF).

On occasion, users on Unix and Macintosh computers may need to change
the line termination on some text files before they can use them.
This can be handled via text editors or a variety of utilities.  For
example, the Unix tr (translate) command can be used to change
carriage returns to blanks:
    tr "\015" " " <oldfile.txt >newfile.txt