Fig. 1
Time evolution of the line area of H
O (top panel), H
O (middle panel), and the HO/HO line area ratio (bottom panel) from August 2014 to April 2016. The thick dashed line represents perihelion, which occurred on August 13, 2015, and the thin dashed lines represent when 67P was 1 AU from closest approach, pre- and post-perihelion.
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