“…The presence of clouds is taken into account in the NO 2 AMF calculation using cloud parameters based on the Optical Cloud Recognition Algorithm (OCRA) and the Retrieval Of Cloud Information using Neural Networks (ROCINN) algorithms (Loyola et al, 2007(Loyola et al, , 2011. OCRA/ROCINN has been applied in the operational retrieval of trace gases from GOME (Van Roozendael et al, 2006), GOME-2 (Valks et al, 2011;Hao et al, 2014;Liu et al, 2019b), and TROPOMI (Heue et al, 2016;Theys et al, 2017;Loyola, in preparation). The latest version of OCRA/ROCINN (Lutz et al, 2016;Loyola et al, 2018) provides two sets of cloud products: one treats clouds as ideal Lambertian reflectors in a "Clouds-as-Reflecting-Boundaries" (CRB) model, and the second treats clouds as uniform layers of water droplets in a "Clouds-As-Layers" (CAL) model.…”