plerrx: Draw x error bar

`plerrx`: Draw x error bar
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#### `plerrx`: Draw x error bar

`plerrx (` | n,
| xmin,
| xmax,
| y`)`;

Draws a set of ``n`` horizontal error bars, the `i`'th error bar extending from ``xmin`[i]` to ``xmax`[i]` at y coordinate ``y`[i]`. The terminals of the error bar are of length equal to the minor tick length (settable using `plsmin`).

`n` (`PLINT`, input)

  Number of error bars to draw.

`xmin` (`const PLFLT *`, input)

  Pointer to array with x coordinates of left-hand endpoint of error bars.

`xmax` (`const PLFLT *`, input)

  Pointer to array with x coordinates of right-hand endpoint of error bars.

`y` (`const PLFLT *`, input)

  Pointer to array with y coordinates of error bar.

Redacted form:

- General: `plerrx(xmin, ymax, y)`

- Perl/PDL: `plerrx(n, xmin, xmax, y)`

This function is used in example 29.

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