Atmospheric pressure of Pluto at r = 1215 km, p₁₂₁₅, as a function of time. The red square indicates the pressure value obtained in our present study (see Sect. 3), overlaid with those obtained between 1988 and 2016 using the same atmosphere model profile (black points; Meza et al. 2019; Sicardy, priv. commun.). The solid and dashed lines (horizontally shifted by +0.1 years for better visibility) represent 1σ and 3σ error bars for the data points, respectively. The 3σ error bar of the 1988 June 09 data point is not shown since the corresponding error value was not provided.