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Cumulative ambient vitamin D UV exposure, in mega Joule per square metre (1 MJ = 106 J), for the period 1st June–31st December 2019 from ground-based measurements (horizontal axis) and TEMIS v2.0 (corrected for the surface altitude, vertical axis), for the nine selected Italian stations. These latter are listed in order of decreasing latitude, from the north to the south.
