TRIPP_FLUX

       Integrates flux in circular or rectangular aperture
       centered on xcen, ycen. See following descriptions
       for details of centering and subpixels.

       Astronomical Photometry.

       TRIPP_FLUX, ima, rad ,xcen ,ycen , MAXINT=maxint, $
               [ flux, area, SUB=sub, QUAD=quad, SILENT=silent, $
                 N_SIGMA=n_sigma ]

       IMA    : 2D image array.
       RAD    : Radius of circular aperture [pixel] for flux integration.
       X/YCEN : Center of aperture, (0,0) is lower left corner of lower
                left pixel in frame.

       NONE.

       NONE.

       SUB     : Number of subpixels = sub^2 for division of original pixel,
                 defaulted to 5.
       QUAD    : Use rectangle with area [2*rad+1]^2 instead of circle.
                 NOTE - in QUAD mode, the quadrangle includes only
                        whole pixels (speed), therefore the center of the
                        mask may be shiftet by a fraction of a pixel in x/y
                        and rad is converted to an integer.
       N_SIGMA : Cut value for sigma filtering (IF /QUAD SET ONLY)
                 aperture, see CCD_BFILT.

       FLUX : Integrated flux in the defined aperture.
       AREA : Area in defined aperture [original (not subdivided) pixels].

       MAXINT : Max. Intensity [ADU] in aperture.

       NONE.

       Uses CCD_ZOOM, deletes and opens new window device 0,
       if /SILENT is not set.

       SATURATED PIXEL ARE DEFINED AS THOSE ABOVE 65000. !

       Ralf D. Geckeler - %CCD% package for IDL - written Sept.96.
                          original name was ccd_flux
       Stefan  Dreizler - 12/1999: use median of background instead of mean

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