# Set terminal and output
set terminal postscript enhanced color
set output 'filled_contours.ps'
 
# Set various features of the plot
set pm3d
unset surface  # don't need surfaces
set view map
set contour
#set key outside
set nokey
set cntrparam cubicspline  # smooth out the lines
set cntrparam levels 50    # sets the num of contour lines
set pm3d interpolate 20,20 # interpolate the color
 
# Set a nice color palette
set palette model RGB defined ( 0'black', 1'blue', 2'cyan',3'green',4'yellow',\
     5'red',8'purple' )
 
# Axes
set xlabel 'COC angle (degree)'
set ylabel 'C-H distance (angstrom)'
set format x '%.1f'
set format y '%.1f'
set format z '%.2f'
 
# Now plot
splot 'filled_contours_data.txt' using 1:2:3 notitle with lines lt 1