set output 'qso_z=6.ps' set term postscript color enhanced font 'Helvetica,18' set key top right set label 1 'g filter' at 420,12 font "Helvetica,18" tc lt 3 set label 2 'i filter' at 700,12 font "Helvetica,18" tc lt 1 set xlabel 'Wavelength (nm)' set ylabel 'Intensity of light' set title 'Quasar spectrum: redshift z = 6 ' plot [50:1000][] 'sdss_qso_z=6.dat' using ($1*0.1):($2) with lines lt -1 lw 1 t '' , 'sdss_g.pass' using ($1*0.1):($2*10) with lines lt 1 lw 1 lc 3 t '' , 'sdss_i.pass' using ($1*0.1):($2*10) with lines lt 1 lw 1 lc 1 t '' set output quit