Figure 9: Metamorphic structure of the Alps. We report metamorphic data along four geological transects of Schmid et al (2004) down to 15-20 km depth. Below this depth, the past metamorphic history should be overprinted by the present thermal regime. a) Eastern transect along the TRANSALP seismic profile. b) Central Alps transect (along the NFP 20 east seismic profile . c) Northwestern Alps transect along the NFP 20 west seismic profile. d) Western Alps. transect, along the ECORS_CROP seismic profile.