pllab: Simple routine to write labels

`pllab`: Simple routine to write labels
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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 1,5,9,12,14-16,20-22,29.

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