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Not all grid names and grid number combinations are supported. Currently, the Gaussian grid names and numbers supported for MARS retrievals are:
| Octahedral reduced Gaussian (O grids) | O1280 | O640 | O512 | O400 | O320 | O256 | O200 | O160 | O128 | O96 | O64 | O48 | O32 |
| Original reduced Gaussian (N grids) | N640 | N512 | N400 | N320 | N256 | N200 | N160 | N128 | N96 | N64 | N48 | N32 | |
| Regular (Full) Gaussian (F grids) |
| F1280 | F640 | F512 | F400 | F320 | F256 | F200 | F160 | F128 | F96 | F64 | F48 | F32 |
MARS requests specifying an unsupported grid will fail. For example, a retrieval request with grid=O123 will return an error. If the letter denoting the type of Gaussian grid is omitted, e.g. grid=320, a full (or regular) Gaussian grid with 320 grid lines is returned.
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