Name of OM OSW source list file true The source number srcnumber in [1:] Radius of source extraction circle (in pixels, if negative, and in FWHMs otherwise) srcradius in [-25.:] Tolerance for contamination (in FWHMs) nfwhm in [0.:] Inner radius of background annulus in terms of source radius bkginner in [1.:] Outer radius of background annulus in terms of source radius bkgouter in [1.:] Name of output source region file true Name of output background region file true