## set mpt

`set mpt type off | <<col><style><thick>>`

command to control map background behavior. `type` is the map type; it can be a number from `0` to `255`, or it can be an asterick(*) to indicate this command applies to all the type values. The `color` can be set to `-1`, which indicates to GrADS to use the `set map` settings for this map type, rather than the settings specified by the `set mpt` command.

### Usage Notes

### Examples

1. Lets say you want to use the hires data set and plot political boundaries, but not state boundaries:

   `set mpt * off
   set mpt 0 -1
   set mpt 1 -1`

2. Lets say you want to use the hires data set, and have coastlines be thicker, and a different color, than political boundaries:

   `set mpt * off
   set mpt 0 1 1 6
   set mpt 1 15 1 1`

3. The `set mpdraw` and `draw map` commands work as before; you can do some interesting line types by overlaying:

   `set mpt 51 7 1 12
   draw map
   set mpt 51 0 1 1
   draw map`

   This would produce two yellow lines parallel and close together for map type 51.