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| gmt-package | Interface between the GMT Map-Making Software and R |
| deg2num | Convert Degrees to Numeric |
| demo.bar | GMT Example Data |
| demo.coast | GMT Example Data |
| demo.par | GMT Example Data |
| demo.text | GMT Example Data |
| demo.xy | GMT Example Data |
| geodist | Distance Between Geographic Coordinates |
| gmt | Initialize GMT Session |
| gmt.demo | GMT Example Data |
| gmt.system | Invoke shell command |
| num2deg | Convert Numeric to Degrees |
| psbar | Add Bars to GMT Mercator Map |
| psclose | Finalize GMT Map |
| pscoast | Draw GMT Map |
| pstext | Add Text/Symbols to GMT Map |
| psxy | Add Lines/Symbols to GMT Map |
| r2gmt | Prepare Data for GMT |