color fill contouring

[Tom R. <ro...@re...>]

Gnuplot users:

Maybe I am just slow, but I have been unable to find an easy way to make
color filled contour plots with Gnuplot.  Attached are 3 PDF files:

1. contour.pdf: a contour line plot from another graphics program
2. shaded.pdf: a color filled version of #1 from the same program
3. gnuplot.pdf: a contour line plot from gnuplot that I would like to
color fill as in #2.

Here is the input file to Gnuplot used to produce #3:

set output "contour.ps"
set term postscript color
set title "CONTOURS" font "Helvetica,25"
set ylabel "LOG P"  font "Helvetica,20"
set xlabel "LOG P" font "Helvetica,20"
set xrange[1:11]
set yrange[1:11]
set size square
unset surface
set view map
set contour
set data style lines
set logscale xy
set contour base
set cntr levels 10
splot 'ijx.dat'
pause -1

None of the Gnuplot 'demo' examples really produce an equivalent to #2,
in my opinion.  I have tried various options to 'pm3d' and 'palette',
but nothing seems to work very well.  I have seen many online queries
about the same problem, and all proposed solutions seem overly
complicated for what should be a fairly simple problem.  Easy for me to
say, of course.

Anyway, if anyone has any suggestions or examples, I will appreciate it.

T. Rosmond