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This filter enables events to be extracted based on other attributes present as columns in the event file. At present a series of ranges can be given with the lower and upper limits separated by a column. For instance, suppose an event file has a column PIXEL then a column filter "PIXEL=1:2 6:7" will give events with PIXEL values of 1,2,6 or 7. More than one column filter can be given. If the filter is given on the command line then it should be enclosed in double quotes. For example:
xsel> filter column "pixel=1:2 6:7" xsel> filter column "flags=0:0"