This appendix describes the syntax of HST data file names, which encode a large amount of information about the files themselves.
All files belonging to a given dataset share the same rootname.
The identifier .fits indicates that this file is in FITS format. See page 2- 11 for instructions on how to convert FITS files to GEIS files using strfits . Because the meanings of these suffixes change from instrument to instrument, please refer to the appropriate instrument-specific Data Structures chapter for their definitions. Several types of file suffixes are, however, common to all instruments. The headers themselves provide short descriptions of each keyword.