Inversion of the CO(2–1) line profile from Fig. 3, assuming a constant expansion velocity of 0.56 km s−1. The production rate per steradian is derived as a function of the colatitude angle (ϕ = 0° on the Earthside, 180° on the opposite), assuming symmetry along the Comet-Earth line. The dots correspond to the values derived for each spectral channel and the connected line with error bars is the running average taking into account thermal broadening. The grey shaded region corresponds to the production rate profile used to determine the total production rates, with vexp =0.56 and 0.50 km s−1 in the dark and light grey regions, respectively (see text).
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