[daip] Spectrum of a blotch region

[Eric Greisen]

Gary A. Welch writes:
 > Dear Aips Helper,
 > 
 > 1. I wish to plot the summed flux within the B=25 mag/square arcsec optical 
 > contour of a galaxy vs velocity.  I can display the contour using TVLOD and 
 > TVSTAR. 
 > 
 > I guess I need to use BLSUM.  In that case, though, I'd like to display the 
 > contour as a guide in defining the blotch region.  I can't figure out how to do 
 > that.  Can you help?

It sounds to me as if what you want is to blank one image with another
- the task BLANK allows this.  Then ISPEC will sum the flux in the
blanked image.

Eric Greisen