Pe number vs. detachment permeability models for the two cross-sections (localized as red lines in a). Panels on the left depict the detachment cross-section for the three tested topographies at the same moment (15 Myr, panel b) and for the first pluton position at three different instants (before, during and after its activity) with a topography of 500 m (panel d). On the right, panels c and e display the secondary fault cross-section with conditions identical to panels b and d, respectively.