Add output grid lat-lon specifications.

templates/prepare_chunk.sh

@@ -132,6 +132,8 @@ dt_restart = ${checkpoint_time}
     taxis_tunit                 = 1
     ml_varlist                  = 'group:dwd_fg_atm_vars', 'group:dwd_fg_sfc_vars'
     remap                       = 1
+    reg_lon_def                 = -30.,0.5,30.
+    reg_lat_def                 = 90.,-0.5, -90.
 /
 &output_nml
     steps_per_file              = 1