Figure shows the time series of total column loadings of methane, due to routine emissions, at the three locations shown in Figure (locations a (high routine emissions), b (medium routine emissions), and c (low routine emissions)). At a 4 km spatial resolution, the column concentrations due to routine emissions, at location c, vary by a factor of 62, from a minimum of 1.4 × 10 -4 mol/m 2 to a maximum of 9.0 × 10 -3 mol/m 2 . At a 1.33 km spatial resolution, the column concentrations, due to routine emissions, vary by a factor of 71, from a minimum of 1.2 × 10 -4 mol/m 2 to a maximum of 8.8 × 10 -3 mol/m 2 .