This task is a convenient amalgamation of xdisplay and imcontour which overlays contours and, if requested, source positions in sky coordinates onto the SAOimage display. As with imcontour the contouring works best on a smoothed image.
input file: rp90_ab_smo.imh2
xp> xplot xp> tvimcontour IRAF image file: rp90_ab_smo Grid type (sky/pix): sky Contour units (pixel/peak/sigma): peak Contour levels: log 5 100 5 xp>
A convenient method for overlaying source positions on an image where you are not interested in the contours and/or an unsmoothed image is as follows:
xp> tvimcontour src_lis=xdata$rp110590_src.tab IRAF image file: xdata$rp110590_im1 Grid type (sky/pix): sky Contour units (pixel/peak/sigma): peak Contour levels: log 100 100 1 # single contour at the peak.
imcontour (See also Smoothing and Contouring) can be used to overlay contours on an existing display with proper setting of the parameters: scale_device and graph_device and perim. Type help imcontour for more information.