set size 0.5,0.5
set ylabel "%"
set xlabel ""
set xtics ("Xhigh" 1,"high" 2,"medium" 3,"low" 4)
set xrange [0:8] 
set title "Raw vs treated"
set terminal postscript eps
set output "cmm.eps"
plot 'cmm.dat' using 1 title "raw"        with linesp 1 0,\
     'cmm.dat'  using 2 title "treated" with linesp 1 1,\
     'cmm.dat'  using 2 title "result" with linesp 1  2