set x2tics out ("0" 1, "5" 20, "10" 40, "15" 60)
set ytics out nomirror ("0" 1,"5" 20, "10" 40, "15" 60)
unset xtics
unset key
#set palette color model RGB function \
#gray<.25?18*gray**2-(21./10.)*gray+(2./5.):1-(gray-.25)**3,\
#1-sqrt(abs(gray-.25)),sin(2*pi*gray)
set palette positive nops_allcF maxcolors 0 gamma 1.5 gray
plot [1:60][1:60]'frac_mu_gnu.dat' w image
set term post eps monochrome enh "Courier,16"
set output 'fractal_mu_lime_shale_50_perc_shale.eps'
replot