This is the command for entering filters to be passed to EXTRACT. Each filter command builds on the list set up by the previous ones. For all the filter commands, a file name proceeded by a - indicates that that file should be removed from the list.
There are nine filter_what values (besides quit): COLUMN, DETECTOR, GRADE, HK, INTENSITY, MKF, PHA_CUTOFF, PHASE, REGION, and TIME. They will be treated in their own subheadings.
Syntax:
xsel > filter <filter_what>