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The target field needs to be gridded, therefore keyword grid should also be specified in the same request.
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This is done automatically provided the differences between N-S and E-W limits are both divisible by the corresponding increments without remainder. 
In this example the black points represent the original grid with 1 degree spacing. The red points show the user defined area, which has the same spacing but shifted by half a degree. MARS will honour the user defined area and return the inner grid shown in green.
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| NORTH = 90° | WEST = -180° | SOUTH = -90° | EAST = 179.5° |
| 73.5/-27/33/45 | |
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| NORTH = 75° | WEST = -15° | SOUTH = 30° | EAST = 42.5°
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| NORTH = 70° | WEST = -20° | SOUTH = 35° | EAST = 20° |
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| NORTH = 75° | WEST = 10° | SOUTH = 30° | NORTH = 40° | EAST = 40° |
| WEST = -20°SOUTH = - 40°EAST = 60° |
| NORTH = 50° | WEST = -135° | SOUTH = -60° | EAST = -35° |
| NORTH = 40° | WEST = 60° | SOUTH = -60° | EAST = 180° |
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specifies a frame three grid points wide with the outer limits 74/60/10/-20 and inner limits 72/58/8/-18.
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