A- Rotation versus latitude for the External zones of the western Alps. An apparent N-S trend of rotation is highlighted by the regression line calculated excluding possible local rotations (R² ∼ 0.26). Full dots: probable local rotations (see discussion in the text). Numbers in brackets correspond to entries in Table 1. Rotations calculated south (yellow) and north (blue) of 45° latitude are indicated. In the South counter clockwise rotation for an age of 25 (10) Ma is 10.3°+ −6.4° (7.6°+ −5.9°). In the North, insignificant rotation for an age of 25 (10) Ma is observed: 4.5°+ −12.8° (7.2°+ −12.6°). B- Oroclinal test (rotation versus strike of the fold axis) for the Subalpine Massifs. The red line shows the total least squares regression for the data. The surrounding shaded pink area illustrates the confidence interval for 1000 bootstrapped regressions.