set terminal png truecolor nocrop enhanced font "DejaVuSans.ttf,12" size 1240,700
set output "kernel-size.png"
set key on top left Left width 2 reverse font "DejaVuSansMono.ttf,10"
set title "Linux kernel source size (tar.bz2)"
set xrange [-5:305]
set xlabel "Version"
set xtics ("1.1.13" 2, "1.2.0" 37, "1.3.0" 51, "2.0.0" 151, "2.2.0" 192, "2.4.0" 219, "2.6.0" 257, "3.0" 296)
set ylabel "MB"
set grid y
set yrange [0:80]
set style data linespoints
f(x)=a*b**(x/c)+1
fit f(x) "kernel-size.dat" using 1:3 via a,b,c
plot "kernel-size.dat" using 1:3 lt rgb "red" notitle, f(x) lt rgb "blue" title "y=0.175822*1.0243^{(x/1.1939)}+1"