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RECT model

The RECT option permits a polar model of the specified psf to be constructed. The syntax is, RECT(psf, xbin[,ybin]) where psf is the name of an instrument psf (eg. XRT_PSPC).

xbin controls the placement of psf model bin boundaries in the x-axis direction. It can be specified as either a single value indicating bin width, or as a bin-boundary specification (values separated by colons). ybin may also be supplied. If omitted, the same bin boundaries are used in the y-axis as in the x-axis. Some examples are,

Bins 10 arcmin wide in both x and y axes.

  RECT(PWFC,10.0)

Bin boundaries are -infinity -> -60, -60 -> -30 and so on to 60 ->infinity

  RECT(PWFC,-60:-30:-10:0:10:30:60)

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