Fig. 3

© swisstopo) with gravity profiles and gravity data from the Gravity Atlas of Switzerland, modified from Bandou et al. (2022). The map also shows the Bouguer anomaly contour lines and the locations of our stations (blue dots) and those of key drillings (stars). The map and the contour lines are from the openly accessible database of swisstopo (‘Carte gravimétrique de la Suisse (Anomalies de Bouguer) 1: 500,000, © swisstopo; Olivier et al., 2008; 2011). The yellow line shows the locations of our profiles (yellow lines, see legend of Fig. 1 for explanation of labels). The gravity values at the green and brown stations are available from the swisstopo database. The data of the brown stations were collected in the framework of various projects, and they are now integrated in the Gravity Atlas of Switzerland. Note that the contour lines were derived from the green stations only