!-----------------------------------------------------------------------
&nam_vvl    !   vertical coordinate options                             (default: zstar)
!-----------------------------------------------------------------------
   ln_vvl_zstar  = .true.           !  zstar vertical coordinate
   ln_vvl_ztilde = .false.          !  ztilde vertical coordinate: only high frequency variations
   ln_vvl_layer  = .false.          !  full layer vertical coordinate
   ln_vvl_ztilde_as_zstar = .false. !  ztilde vertical coordinate emulating zstar
   ln_vvl_zstar_at_eqtor  = .false. !  ztilde near the equator
   rn_ahe3       = 0.0e0            !  thickness diffusion coefficient
   rn_rst_e3t    = 30.e0            !  ztilde to zstar restoration timescale [days]
   rn_lf_cutoff  = 5.0e0            !  cutoff frequency for low-pass filter  [days]
   rn_zdef_max   = 0.9e0            !  maximum fractional e3t deformation
   ln_vvl_dbg    = .true.           !  debug prints    (T/F)
/