The supplementary information for the paper Burgard, C., Notz, D., Pedersen, L. T., and Tonboe, R. T.: The Arctic Ocean Observation Operator for 6.9 GHz (ARC3O) – Part 2: Development and evaluation, The Cryosphere, 14, 2387–2407, https://doi.org/10.5194/tc-14-2387-2020, 2020. can be found on https://github.com/ClimateClara/scripts_paper_arc3o_part2. Signed: Clara Burgard, 21.08.2020