Maps of illumination and densities. Upper panels: left, middle, and right figures represent 2D longitude/latitude maps of average illumination during periods A/B/C. The corresponding 2D maps of H₂O, CO₂, and CO densities in cm^-3 measured by RTOF (the second, third and fourth rows, respectively) normalized at 10 km with a 1/r² scaling law, projected to the SSP longitude and latitude. The latitude 0 separates northern and southern hemispheres and topography lines;white contour lines in the maps are added on the maps based on the 3D shape model provided by ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA.