Friedrich M, Van Roozendael M, FAYT C, Pinardi G. Xianghe HCHO MAX-DOAS MMF and MAPA data from the FRM4DOAS processing system, 2018-2021 [Internet]. Royal Belgian Institute for Space Aeronomy; 2026. Available from: https://data.aeronomie.be/dataset/8cb196cf-eba0-451a-937f-9a3ce930e5d6