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read pixels

Hi, I'm using IDL 5.3 on a Mac with OS8.1. I'm trying to display a tif
and interactively get the x,y of a coordinate I choose with the cursor.
Ideally, I'd like my program to read my click-on x and y into variables.
RDPIX doesn't recognize my cmd-click as a right mouse button so I can
never get out of it.  David's READ_PIXEL program doesn't display the 
coordinates, though it displays the image in a nice widget.  Any 
suggestions on what I am doing wrong or other programs 
to do this task? Thanks!

Barbara Cohen
University of Tennessee