Calibrated data in the archive result from the calibration steps specified by switches in the raw science header (.d0h). If there were problems with the observation, it was set aside for repair. If there were missing packets (due to data transmission problems), and no further packets were forthcoming from the spacecraft, the pipeline replaced missing data with fill data. Information about missing packets and fill data can be found in the trailer file (.trl).
Figure 36.1: GHRS Calibration Process