From: The alpine Swiss-French airborne gravity survey Figure 9 Contour map of the differences in mGal between the airborne Bouguer anomaly values and the upward continued surface Bouguer anomaly values superimposed on the topography (color map) in the area shown in Fig. 8. The differences in the two Bouguer fields are highly correlated to topography in the small rectangular zone marked on the left side of the figure. From: The alpine Swiss-French airborne gravity survey Geophys J Int. 2003;152(1):8-19. doi:10.1046/j.1365-246X.2003.01748.x Geophys J Int | © 2003 RAS 1