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we have reached ambient, so we can get an idea of how long it took to catch up from the graphat 8.45 pm, ambient was 17.5 and starting to flatten out. 1 hour and 15 minutes later it had stabilised at 17.1. the mirror in that time had dropped .8 of a degree.
so the old hour rule is pretty good!!!!
remember .5 of a degree difference or less is best!
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