|Space Telescope Science Institute|
|STIS Instrument Handbook|
17.6 The STIS Cycle 9 calibration plan was modeled closely on the Cycle 8 calibration plan. Supported modes were monitored for items such as sensitivity changes, flat-field evolution, and dispersion solutions.In addition to monitoring instrument health and safety and maintaining the overall calibration of STIS supported modes at the accuracies as established during Cycles 7 and 8, a few special calibration programs were added for Cycle 9, with the following goals:
5: To model the ghosts (which are caused by multiple reflections in the CCD window) in the G750M grating mode.