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

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

Redacted form: `pl_setcontlabelparam(offset, size, spacing, active)`

This function is used in example 9.

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