Multi Sensor Reanalysis of total ozone, version 2. CLIMATE APPLICATIONS: Climate research, ozone monitoring.. OFFICIAL CITATION: van der A, R. J., Allaart, M. A. F., and Eskes, H. J., Extended and refined multi sensor reanalysis of total ozone for the period 1970-2012, Atmos. Meas. Tech., 8, 3021-3035, doi:10.5194/amt-8-3021-2015, 2015.