set output './wave_power_a.ps' 
set term postscript color enhanced 'Helvetica, 18'  
set style line 1 lt rgb 'red' lw 3  
set style line 2 lt rgb 'sea-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 right 
set ylabel 'Height (m)' 
set xlabel 'Distance along surface (m)' 
set title 'Waves approaching shore '
plot [0:80][-1.0:1.0] 0.5*cos(0.314159*x)  with lines       ls 1  t '' 
 
set output 
quit 
