150        ! eta
1.4075e-4  ! xfreq       ! 2.*pi/(12.4*3600.)
50000.     ! sponge_width_left
175000.    ! sponge_width_right
0.01       ! sponge_kappa (stable till ~ 100)
1000.      ! sponge_tau ~ O(2*pi 1/N) ~ 2pi 1/.01 ~ 100*6 --> 1000
93750.     ! x0  position of ridge
350.       ! IB floor
2300.      ! h0  total height is floor + h0
10000.     ! sigma_x, x scale of ridge shape
3000.      ! Lz