pl_setcontlabelparam: Set parameters of contour labelling other than format of numerical label

The PLplot Plotting Library: Programmer's Reference Manual
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### `pl_setcontlabelparam`: Set parameters of contour labelling other than format of numerical label

`pl_setcontlabelparam` (offset, size, spacing, active);

Set parameters of contour labelling other than those handled by `pl_setcontlabelformat`.

`offset` (`PLFLT`, input) Offset of label from contour line (if set to 0.0, labels are printed on the lines). Default value is 0.006. `size` (`PLFLT`, input) Font height for contour labels (normalized). Default value is 0.3. `spacing` (`PLFLT`, input) Spacing parameter for contour labels. Default value is 0.1. `active` (`PLINT`, input) Activate labels. Set to 1 if you want contour labels on. Default is off (0).

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