Two-dimensional latitude-longitude map of 67P with the regions (El-Maarry et al. 2016) and the position of the 24 points studied, as detailed in Table 3. The latitude zero is the equatorial plane of the comet, separating the northern and the southern hemispheres. The centre of the map, i.e., point of latitude 0 and longitude 0, is the extremity of the small lobe. The big lobe area is located at the borders of the maps.