set output 'a_plot_b.ps' 
set term postscript color enhanced 'Helvetica,18' size 10,10  
set style line 1 lt rgb 'red' lw 3  
set style line 2 lt rgb 'green' lw 3  
set style line 3 lt rgb 'blue' lw 3  
set style line 4 lt rgb 'cyan' lw 3  
set style line 5 lt rgb 'violet' lw 3  
set grid 
set key top left 
set ylabel 'Power dissipated (W)'  
set xlabel 'Driving frequency (rad/s)' 
set title '' 
plot [5.0:6.0][] './make_a_data.out' index 0 using 2:(0.7*$8*$8)         with lines ls 1 lw 3 t 'Q = 27'  
set output 
quit 
