After stacking, would tell me that values went to high and caused an integer value to go so high that it started back at zero.
This would be possible in basic software for stacking but PI does this in 32 bit floating point as standard so shouldn't be a problem with too higher value.
Still a mystery.
For the meeting this week I will be out of town again, but on a plus note I will be clearing and levelling the site for the observatory and a couple of concrete pads beside it instead.
Justin
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