From: A gravimetric assessment of the Gotthard Base Tunnel geological model: insights from a novel gravity terrain-adaptation correction and rock physics data
Density model
Surface–topo xcorr
Tunnel–topo xcorr
Model 1
− 0.340
0.324
Model 2
0.014
0.088
Model 3
− 0.142
0.197
Model 4
− 0.500
0.466
Model 5
− 0.844
0.842
Model 6
0.728
− 0.593
Model 7
− 0.019
0.292