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(gnuplot.info)yerrorbars

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 The `yerrorbars` (or `errorbars` (Note: errorbars )) style is only relevant
 to 2-d data plots. `yerrorbars` is like `dots` (Note: dots ), except that a
 vertical error bar is also drawn. At each point (x,y), a line is drawn from
 (x,y-ydelta) to (x,y+ydelta) or from (x,ylow) to (x,yhigh), depending on how
 many data columns are provided. A tic mark is placed at the ends of the error
 bar (unless `set bar` (Note: bar ) is used---see `set bar` for details).