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Xyerrorbars
The xyerrorbars style is only relevant to 2-d data plots. xyerrorbars is
like dots, except that horizontal and vertical error bars are also drawn.
At each point (x,y), lines are drawn from (x,y-ydelta) to (x,y+ydelta) and
from (x-xdelta,y) to (x+xdelta,y) or from (x,ylow) to (x,yhigh) and from
(xlow,y) to (xhigh,y), depending upon the number of data columns provided. A
tic mark is placed at the ends of the error bar (unless set bars is
used -- see set bars (p. ) for details).
If data are provided in an unsupported mixed form, the using filter on the
plot command should be used to set up the appropriate form. For example,
if the data are of the form (x,y,xdelta,ylow,yhigh), then you can use
plot 'data' using 1:2:($1-$3):($1+$3):4:5 with xyerrorbars
Ethan Merritt
2007-03-03