[Gnuplot-info] pm3d and contours

[Paul S. <lan...@gm...>]

I am trying to plot data with pm3d and contours, but the contours don't
show up on the plot. The data file is attached and the script is below:

#!/usr/bin/env gnuplot

set term pngcairo enh col size 800,600 font ",18"
set output 'out.png'

unset key
set palette maxcol 0

set contour surface
set cntrparam levels discrete 0.1
set pm3d map interp 0,0
splot 'test.txt' us 1:2:($6/$7)

The pm3d plot is rendered correctly but the contours are missing. Any
ideas?