The PLplot Plotting Library: Programmer's Reference Manual
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### `pllab`: Simple routine to write labels

`pllab` (xlabel, ylabel, tlabel);

Routine for writing simple labels. Use `plmtex` for more complex labels.

`xlabel` (`const char *`, input) Label for horizontal axis. `ylabel` (`const char *`, input) Label for vertical axis. `tlabel` (`const char *`, input) Title of graph.

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`pljoin`: Draw a line between two points | Up | `pllightsource`: Sets the 3D position of the light source