plmeridians: Plot latitude and longitude lines

`plmeridians`: Plot latitude and longitude lines
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#### `plmeridians`: Plot latitude and longitude lines

`plmeridians (` | mapform ,
| dlong ,
| dlat ,
| minlong ,
| maxlong ,
| minlat ,
| maxlat `)`;

Displays latitude and longitude on the current plot. The lines are plotted in the current color and line style.

`mapform` (``PLMAPFORM_callback``, input)

  A user supplied function to transform the coordinate longitudes and latitudes to a plot coordinate system. By using this transform, we can change from a longitude, latitude coordinate to a polar stereographic project, for example. Initially, x[0]..[n-1] are the longitudes and y[0]..y[n-1] are the corresponding latitudes. After the call to mapform(), x[] and y[] should be replaced by the corresponding plot coordinates. If no transform is desired, mapform can be replaced by NULL.

`dlong` (``PLFLT``, input)

  The interval in degrees at which the longitude lines are to be plotted.

`dlat` (``PLFLT``, input)

  The interval in degrees at which the latitude lines are to be plotted.

`minlong` (``PLFLT``, input)

  The value of the longitude on the left side of the plot. The value of minlong must be less than the value of maxlong, and the quantity maxlong-minlong must be less than or equal to 360.

`maxlong` (``PLFLT``, input)

  The value of the longitude on the right side of the plot.

`minlat` (``PLFLT``, input)

  The minimum latitude to be plotted on the background. One can always use -90.0 as the boundary outside the plot window will be automatically eliminated. However, the program will be faster if one can reduce the size of the background plotted.

`maxlat` (``PLFLT``, input)

  The maximum latitudes to be plotted on the background. One can always use 90.0 as the boundary outside the plot window will be automatically eliminated.

Redacted form: `plmeridians(mapform, dlong, dlat, minlong, maxlong, minlat, maxlat)`

This function is used in example 19.

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