  Using Gaussian Process regression to analyze the Martian surface methane
Tunable Laser Spectrometer (TLS) data reported by Webster (2018), we find that
the TLS data, taken as a whole, are not statistically consistent with seasonal
variability. The subset of data derived from an enrichment protocol of TLS, if
considered in isolation, are equally consistent with either stochastic
processes or periodic variability, but the latter does not favour seasonal
variation.
