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21 March 2017 at 9:29 am #578044
If we choose reference with same air mass doesn’t that ensure correction OK? Only if we try to use that instrument correction for target at different air mass then there will be a discrepancy. Since in practice it’s probable there will always be a difference, the question would be “how big a difference?” before it’s significant. [if it ever stops raining here I might try to explore that for myself].