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Поисковые слова: annular solar eclipse
*isoreg* - A region defined by an isointensity contour next up previous contents
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*isoreg* - A region defined by an isointensity contour

A region file can be made which defines the region enclosed within a specific intensity level contour. First the image must be smoothed: 

  cl> xray
  xr> xspatial
  xs> imsmooth ``xdata$snr.qp(400:600,400:600)'' snr gaus 5  # output is snr_smo.imh
  xs> isoreg xnr_smo snr 0.2                                  # output is snr_iso.pl
  xs> pllist snr_iso.pl                                            # shows the mask.


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1998-06-10