1 Minimum of the mean ozone column in the polar vortex (top) for
2 March in the Arctic (below) for October in the Antarctic
3 derived from the ozone climatology of Bodeker Scientific and OMI
4 satellite data. Open symbols for years in which at the time
5 the polar vortex was already broken down. After Müller et al. (2008) [#]_
8 .. [#] Müller, R. et al., Simple measures of ozone depletion in
9 the polar stratosphere, Atmos. Chem. Phys., 8, 251-264, 2008,
10 https://doi.org/10.5194/acp-8-251-2008.