Gnuplot fill error bars as transparent shades

Question

Hi all,

I have input data as:

x(1),y(2),z(2)

x(2),y(2),z(2)

and so on,

where x and y values are on x-axis and y-axis, respectively, and the z values are the error bars. From Gnuplot, how could I reproduce the figure, in which the error bars of multiple plots are transparent?

Any idea? Thanks!

Answer 1

The plot style with filledcurves can be used with 3 columns of input data to produce the shaded regions. The central lines would have to be drawn separately. Gnuplot expects input

x y1 y2

so if your data is in the form x, y, delta-y you can construct the gnuplot commands by constructing y1 and y2 in the using specifier

set term png truecolor  # or "set term pngcairo"
set output 'fill.png'
#
set style fill transparent solid 0.25 # partial transparency
set style fill noborder # no separate top/bottom lines
plot 'data' using 1:2 with lines lc "blue" title "Force", \
     'data' using 1:($2-$3):($2+$3) with filledcurves lc "blue" notitle, \
     'data' using ($1-Shift):2 with lines lc "green" title "Shift", \
     'data' using ($1-Shift):($2-$3):($2+$3) with filledcurves lc "green" notitle