This erratum corrects Eq. (13a) in Appl. Opt. 55, 3104 (2016) and shows its effect on the proposed dip estimate functions Eqs. (21a)-(21d2). The differences are small, maximal up to a few percent and well within the original error limits. A new figure shows how the variability of the terrestrial refraction of the dip-as estimated with the proposed estimate functions-decreases with increasing observer heights. (c) 2018 Optical Society of America.
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