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selectlib (selectlib-4.76) [xmmsas_20211130_0941-20.0.0]

region-filter

region(reg.fits,x,y) is true if the point $(x,y)$ is contained in any of the regions specified in the region file reg.fits.

If the second form of the region filter region(reg.fits) is used the coordinates of the test points come from columns with names taken from the MFORM1 attribute in the specified block.

For more informations on this and a formal definition of the region file format see Ref. [3].



XMM-Newton SOC -- 2021-11-30