set terminal postscript portrait enhanced color size 135cm,97.5cm font "Helvetica,45"
set pm3d map
set palette defined ( 0 "green", 1 "blue", 2 "red", 3 "orange" )
set xlabel '{/Symbol a}' font "Helvetica,60"
set ylabel 'd{/Symbol a}/dt' font "Helvetica,60"
splot "chaosMP.dat" u 1:2:3 notitle with dots palette