set output 'spec_red_opt.ps' 
set term postscript color enhanced 'Helvetica,18'  
set grid 
set key top right 
set ylabel 'Flux per unit wavelength (arb scale)' 
set xlabel 'Wavelength (Angstroms) ' 
set title 'Stellar spectra in red optical '
plot [6000:7200][] './ukb3v_dat' using ($1):(0+$2*4)       with lines lt 1 lc 3 lw 3 t 'B3V'  ,                   './ukg5v_dat' using ($1):($2*3)       with lines lt 1 lc 2 lw 3 t 'G5V'  
set output 
quit 
