A simple example.
eoptloadmask srclisttab=usno.fits:SRCLIST maskset=outmask_usno.ds \ templateset=P0126700201M2S002IMAGE_8000.FIT \ radius=20 expressions='(BMAG<10)||(RMAG<10)'
A slightly more complicated example with two input catalogues.
eoptloadmask srclisttab='usno.fits:SRCLIST iras.fits' maskset=outmask_all.ds \ templateset=P0126700201M2S002IMAGE_8000.FIT \ radiusstyle=column colradius='Radius Radius_Arcsec' \ colnamestyle=user colra='RA_Cat RA_J2000' coldec='DEC_Cat DEC_J2000' \ expressions='(BMAG<10)||(RMAG<10) FR_30GHz>1e5' isinverted=no