plerry: Draw error bars in the y direction

`plerry`: Draw error bars in the y direction
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#### `plerry`: Draw error bars in the y direction

`plerry (` | n,
| x,
| ymin,
| ymax`)`;

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

`n` (``PLINT``, input)

  Number of error bars to draw.

`x` (``PLFLT_VECTOR``, input)

  A vector containing the x coordinates of the error bars.

`ymin` (``PLFLT_VECTOR``, input)

  A vector containing the y coordinates of the lower endpoints of the error bars.

`ymax` (``PLFLT_VECTOR``, input)

  A vector containing the y coordinates of the upper endpoints of the error bars.

Redacted form:

- General: `plerry(x, ymin, ymax)`

- Perl/PDL: `plerry(n, x, ymin, ymax)`

This function is used in example 29.

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