reset

set term postscript enhanced eps color size 8.6cm,6cm font "Helvetica, 16pt"
set output 'spectrum.eps'

# set key font "Helvetica, 24" at 300,-40 
set ylabel 'signal power (dBm)' 
#font "Helvetica, 26" offset -2,0
set xlabel 'frequency (MHz)' 
# font "Helvetica, 26" 
# set key at 200,-35
#set xlabel 'output' 
set xrange [0:200]
set yrange [-90:-30]
set xtics
set ytics
#set xtics offset 1,-1

# figure1
set origin 0,0
set title '' font "Helvetica, 28"
plot 'electronic.spa' using 3:2 w l lt 1 lc rgb 'black' title 'electronic noise', 'classical.spa' using 3:2 w l lt 2 lc rgb 'green' title 'classical noise', 'balanced.spa' using 3:2 w l lt 1 lc rgb 'red' title 'shot noise', -52.2 w l lt 3 lc rgb "orange" title 'theory'