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keylabelgnuplotcontour

key colors in a contour plot

I'm trying to make a contour plot. With the current script I have got the following figure: A contour

Here is the script I used to produce the figure:

#!/usr/bin/gnuplot
set term png font ",18" enh size 1000,1000
set view map
unset surface
set contour base
set cntrparam level incremental 0.005, 0.02, 0.5
set key at screen 1, 0.9, 0
set rmargin 0.50
#
a=6.3457
set xra[0.:2.60*a]
set yra[0.:1.73*a]
set xtics out nomirror
set ytics axis in offset -4.0,0 nomirror
set label "r (a.u)" at 3.4,-2.2 center
set label "r (a.u)" at -1.7,2.5 rotate by 90 center
set out 'M.1.-1.112.3.888.png'
splot 'M.1.-1.112.3.888.dat' u 1:2:3 w l lw 2 t ''

My problem is that I don't like how the colors in the key to indicate the values, they seem to change randomly. Is there a way (gnuplot command) to make the colors change gradually, like the following? enter image description here

Solution

  • You have to change lintetypes manually, like:

    set linetype 1 lc rgb "#B22222"
set linetype 2 lc rgb "#B22233"
set linetype 3 lc rgb "#B22244"
set linetype 4 lc rgb "#B22255"
# ect...

    OR

    set style line 1 lc rgb "#B22222"
set style line 2 lc rgb "#B22233"
set style line 3 lc rgb "#B22244"
set style line 4 lc rgb "#B22255"
# ect...