anchor.diff:  
       relaxation_damping_factor = -ONE
       sponge_timescale = -ONE
  +    rotation_include_coriolis = 1
   
       if (ioproc) then
          print *, ""
  
positive.code: 
      if (problem .eq. 1 .and. do_rotation .eq. 1) then
         call bl_error("The free-fall problem does not make sense in a rotating referance frame.")
      endif
  
      ! Make sure we have a sensible eccentricity.
  
negative.code: 
      use problem_io_module, only: ioproc
      use sponge_module, only: sponge_timescale
      use meth_params_module, only: rot_period, do_rotation, rotation_include_coriolis
  
      implicit none
  
  