iraf.net

NUMBER:	480
MODULE:	pdm
SYSTEM:	-V2.113b
DATE:	Thu Feb 22 16:36:42 MST 2001
FROM:	valdes

BUG:	If the input data does not begin with the minimum x value (when
	there are two or three columns) then a memory corruption error may
	occur.  Even if it does not occur, the theta statistic will come
	out wrong and so all results will be invalid.  The workaround is to
	make sure the first data point of the input file(s) is the minimum
	value.  One could also sort the files, though if multiple files are
	being merged they should be merged externally into one sorted file
	or else insure the first input file has the proper minimum.

STATUS:	A fix was made to fix the immediate problem.  It is not clear
	whether there are other possible problems due to lack of a
	sorted input.