| Variable Name and Aliases | Default Value | Arguments, Unit, Description |
| grid.conf |
| dir_base|dir_base_directory | | base directory in which all subordinated files can be found |
| GridType|type | sp1D | selection: sp1D|sp3D|pp1D|pp3D :grid type sp = spherical, pp = plane parallel, 1D or 3D |
| planet_radius|Re|earth_radius | 6377.500000 | [km] radius of the planet for spherical grids |
| ground_level|ground_altitude | 0.000000 | [km] ground height level |
| fn_longitude_grid|fn_phi_grid | file | [degree] 1 column |
| fn_colatitude_grid|fn_theta | file | [degree] 1 column |
| fn_altitude_grid | file | [km] 1 column |
| fn_X_grid | file | [km] 1 column |
| fn_Y_grid | file | [km] 1 column |
| fn_Z_grid | file | [km] 1 column |
| b_cyclic_x | no | cyclic x coordinate? |
| b_cyclic_y | no | cyclic y coordinate? |
| b_cyclic_z | no | cyclic z coordinate? |
| b_s3d_one_longitude_cell | no | only one huge longitude cell? |
| b_s3d_one_colatitude_cell | no | only one huge colatitude cell? |