Fig. 18
Spectra in LR at 22 u q−1 over three latitudinal regions prior to the 1st of March 2015: above +30° (upper panel, ~170 stacked individual spectra), between −30° and +30° (middle panel, ~470 stacked individual spectra), and below −30° (bottom panel, ~290 stacked individual spectra). Due to a uneven latitudinal coverage when DFMS was operating in ion mode, more spectra were acquired above the Southern Hemisphere which might be a source of observational bias.
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