\label{fig:Ellehoj_data_obs_to_act_dist} The bottom left panel shows a scatter plot (blue dots) of Martian dust devil encounters observed by the meteorological instruments on the Pheonix Lander and reported in Table 1 from \citet{Ellehoj_2010}. Copper-to-black shaded contours show the corresponding density estimated using a Gaussian kernel density estimator, with darker colors indicating higher densities. The blue lines in the top and right panels show the marginalized, normalized distributions of \(\tau_{\rm obs}\) and \(P_{\rm obs}\), respectively. The bottom left panel also shows white contours representing the density of \(\tau_{\rm act}\) and \(P_{\rm act}\), while the white lines in the top and right panels show the corresponding normalized, marginalized densities.