*imcnts* - Radial Profile in a Quadrant

Obtain a radial profile for a quadrant of the central point source:

input file: xdata$snr

output file: snr_cnt.tab

  xs>  imcnts 
  source image file:  xdata$snr[pi=2:10] 
  source region descriptor:  pie 503 513 0 90 & a 503 513 0 50 n=5     # see below 
  background image file or cts/pixel:  xdata$snr.qp [pi=2:10] 
  background region descriptor:  a 503 513 100 150 
  rootname for output file [root_cnt.tab]:  snr 

  xs>

The source region descriptor defines a series of annuli within a 90$^{\circ}$ pie slice from 0$^{\circ}$ (+ y axis) to 90$^{\circ}$ (counter-clockwise) to generate a radial profile (see Displaying a Radial Profile).