From Richard Schwartz:
Two changes have been made in building the calibrated_eventlist data structure that is used for all imaging:
1. The error term of the solar aspect system (SAS) solution is now checked and if it is too large those elements of the data structure have their counts and livetime set to 0 so they won't be used in making images. This check runs all of the time and cannot be disabled other than by compiling hsi_calib_eventlist_raw__define.pro in hessi/idl/util. Most of the time it has no effect except when the spin axis becomes so close to the limb that the aspect solution is degraded.
2. There is now a correction that can be used to make images through attenuator state changes. The attenuator state correction is folded into the GRIDTRAN field of the hsi_calib_event structure for all valid attenuator states after the initial one during the imaging time interval. It is enabled if the control parameter, CBE_MULTI_ATTEN_THRESHOLD, is changed from its default of -1 and the minimum energy of the image (energy_band) is greater or equal to this value. Also, when this is enabled and USE_FLUX_VAR is set, then the demodulation routine that determines FLUX_VAR by determining the flare time variation uses a new version that is considered more robust. After May 1 we will probably use this new demodulation routine in all cases to determine FLUX_VAR.