pllab: Simple routine to write labels

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.

Redacted form: `pllab(xlabel, ylabel, tlabel)`

This function is used in examples 1,5,9,12,14-16,20-22.

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