reset

set term postscript enhanced eps color size 11.69in,8.27in linewidth 3
set term postscript landscape
set output 'spectrum.eps'

set tmargin at screen 0.90 
set bmargin at screen 0.15
set lmargin at screen 0.15
set rmargin at screen 0.90

set size 1,1
set title font "Helvetica, 28"
set key font "Helvetica, 24" right top

#set ylabel '' font "Helvetica, 26" offset -2,0
#set xlabel '' font "Helvetica, 26"
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 font "Helvetica, 22"
set ytics font "Helvetica, 22"
#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', 'balanced.spa' using 3:2 w l lt 1 lc rgb 'red' title 'balanced noise', 'classical.spa' using 3:2 w l lt 2 lc rgb 'green' title 'classical noise'