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filter phase

This allows you to enter one epoch-period combination, and up to ten phases. The subsequent extract command will use the union of all these phases to filter the data. If there is a phase file already present, you are given the chance to save it before proceeding. 

xsel > filter phase epoch period phase save_file

The epoch is in MJD (in the same time system as the data), the period in days, and the phase(s) run from 0-1.

So to filter using the epoch 40000, period of .5 days, and the first and third quarters of the period, say 

xsel > filter 40000 .5 "0.0-.25,0.5-0.75"

The double quotes are necessary to protect the comma.