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Aerosol optical depth at 355 nm on 23–24 December 2015 obtained from MERRA-2 (line + symbols) and from the Raman lidar measurements (solid lines). The results are given for two height intervals: 750–2000 m (red) and 2500–4500 m (black). Zero of timescale corresponds to 00:00 UTC on 24 December.
