Localisation of the cloud observed in this study (17 November 2020) versus those of the clouds reported in the literature. Upper panel: observation reported in this study localised on Mars (bright green) and compared to the magnetic anomaly. Also plotted is the observation in Sanchez-Lavega et al. (2015) on 3 December 2012 (pale green). The magnetic map comes from Connerney et al. (2005). Lower panel: previous detections of CO₂ clouds (red stars) (Clancy et al. 2007; Määttänen et al. 2010; Vincendon et al. 2011) projected on an albedo map, compared to the actual detached layer observation.