reset

set autoscale xfixmin
set autoscale xfixmax
set autoscale yfixmin
set autoscale yfixmax

set xlabel "x" font ", 18"
set ylabel "y" font ", 18"
set tics   font ", 18"

set pm3d map
set palette defined
splot "laplace2D_00.bin" bin array=128x128 format='%lf' dx = 1.0/128 dy=1.0/128