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convert_coord problem


I have a widget with several graphic windows. On of it returns the
co-ordinates of the mouse button if pressed. These co-ordinates are then
converted from device to data (longitude, latitude) using the convert_coord
routine, and some data is plotted in the other windows. Now comes my
problem: the convert_coord routine gives the correct co-ordinates only in
its first call. when I try to convert another pair of co-ordinates the
result is flawed. What can be wrong???


p.s.: I use IDL 5.2 under Windows NT