Extended Data Fig. 1: Frequency of temperature and water vapour pressure pairings.

In Fig. 1, the Mars-relevant pairings of surface temperature and atmospheric water vapour pressure are contained between the cyan lines. Here we show the frequency (in colour) of each combination of surface temperature and water vapour pressure predicted by MarsWRF in support of the presented analysis in Figure 1. Frequency here is the log base 10 of the number of hours across the surface of Mars at a 5^∘ × 5^∘ latitude/longitude grid and one-hour temporal resolution. For the purposes of counting, temperature and water vapour pressure were binned in increments of 1 K and 1 Pa. Here the cyan lines from Fig. 1 are in black.