[David Trowbridge]

David and Robin,

Your suggestions are spot on and I no longer have that error. Processing now runs to completion. Very helpful.

For some reason, some of my spectral images appear with two parallel traces close together, but at different Y-values. I suspect it may be a tracking problem — as if the mount is being over-corrected, causing the telescope to oscillate between two slightly different directions.

Thank for your assistance.

David

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