set terminal postscript eps color enhanced solid font "Helvetica,18" size 8.6cm, 6cm

set output "dark_lifetime(gnu).eps"

set tmargin at screen 0.85
set bmargin at screen 0.2
set lmargin at screen 0.15
set rmargin at screen 0.9

set pointsize 0.5
set title "Atom Lifetime"
set xlabel "Time (ms)"
set ylabel "Probability"

f(x) = a* exp(-x*b) 
a = 1; b = 0.1
fit f(x) "dark_lifetime_data.dat" using 1:4 via a,b

plot [0:350][0:1] f(x) lc rgb "blue" t "fitted line", "dark_lifetime_data.dat" using 1:4:5 w yerr pointtype 7 lc rgb "red" t "data points"

print a, b