The monthly zonal mean ozone profile data are based on ACE-FTS Level 2 profiles (Bernath et al., 2005; Bernath, 2017), retrieved with the University of Toronto processor UoT v3.5/3.6 and included into the new version of the HARMonized datasets of OZone profiles (HARMOZ_ALT, Sofieva et al., 2013). A more detailed description of the MZM data processing and dataset parameters can be found in the README file with the data and in (Sofieva et al., 2017).