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Note that SO2 measurements are in DU for UV-visible and thermal IR instruments (vertical column density)
period time long. lat. SO2 instrument SZA link plot
2019/01/01 00:41 143.0 41.6 4.2 GOME2b 69.7 region 211
2019/01/01 12:46 -52.3 -15.0 23.8 GOME2b 39.9 region 304
and in K for IASI instrument for year 2013 and following (brightness temperature difference).