Trace upwards through call tree for grid

  1. grid is dummy arg 1 of med_sidata_input (main/real_em.f);
     corresponding actual arg is grid, arg number 0 in call 1 by med_sidata_input (main/real_em.f).

grid is not an argument to real_data. May be local or use-associated.
real_data has 0 arguments

grid is an actual arg in calls to these routines from med_sidata_input
  open_r_dataset (argument 3 ; matching dummy arg is grid with intent inout)
  input_aux_model_input1 (argument 2 ; matching dummy arg is grid with intent inout)
  init_module_optional_si_input (argument 1 ; matching dummy arg is grid with intent inout)
  optional_si_input (argument 1 ; matching dummy arg is grid with intent inout)
  init_domain (argument 1 ; matching dummy arg is grid with intent inout)
  assemble_output (argument 1 ; matching dummy arg is grid with intent inout)