Notes. SEM, standard error of the mean; LS, solar longitude; CI, confidence interval; LMST, local mean standard time. The global pressure multiplier is derived from in situ REMS pressure measurements and is the number by which the original measured in situ values of methane were multiplied to correct the results to the global mean annual mixing ratio given in the last two columns. The in situ values can be found by dividing the last two columns by the global pressure multiplier, and are also given in the appendix tables. The quoted SEM value is calculatedfrom the square root of the sum of the squares of the errors on the individual methane lines (see appendix). Earth date and ingest time refer to the time at which the two-hour gas ingest was started. The enrichment results plotted in Fig. 1 and day/night discussion do not include the large spike observed on sol 2442.16 that is described later.