 $fortin

  prob_type = 4
  zero_dir  = 3

  in_xvel = 1.0
  in_yvel = 0.0
  in_zvel = 0.0
  in_density = 1.0
  in_tracer = 0.0

  xblob = 0.5
  yblob = 0.5
  zblob = 0.5
  radblob = 0.2
  denblob = 10.

 $end

