NUMBER:	240
MODULE:	ptools.pexamine
SYSTEM:	V2.10
DATE:	Tue Mar 15 08:43:20 MST 1994
FROM:	davis

BUG:	If either or both of the columns specified by the pexamine task
	parameters xcolumn or ycolumn is undefined in the input image data,
	then pexamine will crash with a segmentation violation if the user
	types the o keystroke command in image cursor input mode. The problem
	occurs because the o keystroke command switches the task to graphics
	cursor mode, and tries to move the graphics cursor to a point in the
	default x-y plot which is undefined.

STATUS:	The bug is fixed in 2.11. The workaround is to set the xcolumn and
	ycolumn parameters to a column that is defined in the input data.