During PODPS pipeline calibration, GEIS format data sets consisting of Standard Header Packets, Unique Data logs, a Science Data file, and an Extracted Data file are created for the High Resolution Spectrograph (HRS). The Science Data files and Extracted Data files also have corresponding Data Quality Mask files. Each file comprises two parts-an ASCII header file and a binary data file. All files for a particular observation have the same root file name; the type of data in each file is identified by its extension (Table 1). These data sets are used as input to the standard calibration program, CALHRS, which produces a new set of calibrated data files (Table 2). All calibrated data file headers are a copy of the Science Data header. Appropriate header keywords contain updated values. The different types of data files are described in detail below.
