replot
set output "entropy-cutoff.png"
set terminal png font FreeSans 10 size Png_Width, Png_Height enhanced
set terminal png font "FreeSans 10" size Png_Width, Png_Height enhanced
set output "entropy-cutoff.eps"
set output "entropy.png"
set output "entropy.eps"
set output "gaussian.png"
set output "gaussian.eps"
set output "laplacian-of-gaussian.png"
set output "laplacian-of-gaussian.eps"
set output "sharp-edge.png"
set output "sharp-edge.eps"
set output "smooth-edge.png"
set output "smooth-edge.eps"