Chapter 2:
HST File Formats

2.1 HST Data Files

2.2 Multi-Extension FITS File Format

2.2.1 Working with Multi-Extension FITS Images in IRAF

2.2.2 Working with FITS Table Extensions

2.3 GEIS File Format

2.3.1 Converting waivered FITS to GEIS

2.3.2 GEIS Data Groups

2.3.3 Working with GEIS Files

2.3.4 Waivered FITS Format

Chapters 2 and 3 assume that the reader is familiar with basic IRAF/STSDAS syntax. If terms such as login.cl, epar, lpar, and apropos are not familiar to the reader, we recommend skipping to the IRAF Primer included in Chapter 4.