I can answer the 0.00 value question for wavdetect; on occasion sources (often
cosmic rays) are detected by wavdetect as single pixels. Wavdetect interprets
this as an infinitely well-known source position, since it must be at that
pixel, and thus gives the axis lengths as zero (or NaN sometimes, I think).
1-D lines of pixels also appear and get zeroes in only one region axis. I
would agree that this is a bug.
-Craig
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