set output 'tesla_power.ps' 
set term postscript color enhanced 'Helvetica,18'  
set grid 
set key top left 
set xlabel 'engine angular velocity (RPM) ' 
set ylabel 'engine power (kW)) ' 
set title 'Tesla vs. Corvette  '
plot [0:6500][] 'electric_engine.dat' using ($1):($3/1000)    lt 1 lc 3 pt 5 ps 2 lw 4 t 'Tesla'  ,                 'graph_power.dat' using ($1):($3/1000)    lt 1 lc 1 pt 3 ps 2 lw 2 t 'Corvette'  
set output 
quit 
