Fig. A.1

Schematic of the configuration between the Sun (yellow), the comet (black), and a water molecule to determine the column density at a given
(r, χ) in the coma. s
is the abscissa along the line between the molecule and the Sun. s0
is the lower bound of integration (s0 < 0 and χ > π∕2 in the figure as s
increases sunward). rs
is the cometocentric distance for a given s, which is .
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