set output 'spec_k3_e.ps' 
set term postscript enhanced color 'Helvetica,18'  
set grid 
set key top left 
set xlabel 'Wavelength (Angstroms) ' 
set ylabel 'Intensity (arbitrary scale) ' 
set title 'Adding spectra of K3 III stars: v = -200, -100, 0, +100, +200 km/s 
plot [5100:5300][] 'k3_spec2.dat' using ($1):($2)   with lines lc 1 lw 2 t 'v = 0 km/s'   ,     'summed_all.dat' using ($1):($2*1.0)   with lines lt 1 lc -1 lw 2 t 'sum of all'   
set output 
quit 
