set terminal postscript eps color enhanced solid font "Helvetica,14"
#set termoption enhanced #size 8.6cm,5cm
set nobars
set border 3
set output 'plot_F.eps'
set size 0.86,0.5;
set multiplot 
#layout 1, 2 ;
#set sample 1000,1000
set size 0.42,0.45;
set origin 0.4,0
f(x)=(x>0)?bg+(a*exp(-(x-x0)/c)):0
g(x)=(x<0)?bg1+(a*exp((x-x0)/cp)):0
x0=0;a=100;c=10;cp=3.5;ap=100;bg=1;bg1=0.05
set xtics nomirror
set ytics nomirror
set ytics 2
set xtics 25
#fit [0:] f(x) 'out1.dat' u ($1-138.5):($2/50.3) via a,c
fit [-60:100] (f(x)+g(x)) 'out1.dat' u ($1-138.9):($2/50.3) via a,cp,c,bg
#set label font "Helvetica,14" "Y" at first -40, first 6
set termoption enhanced
#set label "{/Helvetica-Italic Y}" at first -40, first 6
set label "{/Helvetica-Oblique y}" at first -40, first 6
set xlabel font "Helvetica,14" "{/Symbol D}t (ns)"
set ylabel font "Helvetica,14" "Coincidence rate"
plot [-60:100] 'out1.dat' u ($1-138.5):($2/50.3):(sqrt($2)/50.3) w yerrorbars notitle pt 7 ps 0.5 lc rgb 'red',(f(x)+g(x)) lc rgb "#007700" lw 3 lt 2 notitle
#lc rgb "black" lw 2 lt 1 notitle
#set rmargin at 1.1
set size 0.42,0.45;
set origin 0.02,0
x0=0.1;a=100;c=10;cp=3;ap=100;bg=1;bg1=0.1
fit [-60:100] (f(x)+g(x)) 'out.dat' u ($1-138.7):($2/25.3) via a,c,cp,bg

unset label
set xtics nomirror
set ytics nomirror
set ytics 10
set xtics 25
set termoption enhanced
#set label "{/Helvetica-Italic X}" at first -40, first 6
set label "{/Helvetica-Oblique x}" at first -40, first 30
#set label font "Helvetica,14" "X" at first -40, first 30
#set label font "Helvetica,14" "{/Helvetica-Italic Y}” at first 125, first 6
#set label font "Helvetica,16" "1(a)" at first -35, first 800
#set label font "Helvetica,16" "Coincidence /s" at first -63, first 200 rotate by 90
set xlabel font "Helvetica,14" "{/Symbol D}t (ns)"
plot [-60:100] 'out.dat' u ($1-138.7):($2/25.3):(sqrt($2)/50.3)w yerrorbars notitle pt 7 ps 0.5 lc rgb 'red',(f(x)+g(x)) lc rgb "#007700" lw 3 lt 2 notitle

#set lmargin at .5
unset multiplot