Figure S3 . Total column ozone (DU) on March 30th 2020 (a) observed by the Ozone Monitoring Instrument (OMI), (b) from model run CNTL and (c) from model run ODS95. The 220 DU contour is indicated in white. Panel (d) shows the difference in column ozone (DU) between runs ODS95 and CNTL.