set terminal postscript  eps color enhanced solid font "Helvetica,22" size 15cm, 8.5cm
set colors classic
set output "gsi.eps"

src_cross="max_g2.dat"

set bar 0
set border 11
set isosamples 40,40
set samples 1000,1000
# set size 1,0.8
# set origin 0,0
# unset label
set ylabel font "Helvetica,24" "G^{(2)}"
set ytics 100 nomirror
set xtics 10 nomirror scale 0.5
set y2range [0:17.5]
set y2tics 5
set y2label "g^{(2)} ({/Symbol \664} 10^3)"
set xlabel font "Helvetica,24" "{/Symbol D}t (ns)" #at first 3, first -50
# set label "g^{(2)}(0)= 14.60(12) {/Symbol \664} 10^3" at first 2, first 370

# fitting
f(x)=sqrt(B**2)+A*exp(-(x-x0)/C)
A=350
B=0.1
C=4
x0=0.01

fit [1:] f(x) src_cross u ($1-328):2 via A,B,C,x0

plot [-20:40][0:420] src_cross u ($1-328):2:(sqrt($2)) w yerrorbars notitle pt 7 ps 2 lc rgb "red",\
    f(x) lc "blue" lw 5 notitle
    # lw 2 lt 2 notitle