Left: 2D maps of the average illumination of the surface during the periods A, B, E, F, and G described in Table 1, based on the average subsolar latitude and the heliocentric distance. Colors give the normalized intensity, maxima in red and minima in blue. Right: spatial heterogeneities of RTOF H₂O number densities (log 10) in cm⁻³ projected onto the SSC point, and scaled to a distance of 1 km from the center of the nucleus, for the seven periods (see Table 1).