set term png
set out "/dev/null"

## set key 0,0,0,0
set yrange[20000:100]
set logscale y
  plot "4774120189.log"  using 1:2  t 'Vim    4774120189' with lines 
replot "4774119407.log"  using 1:2  t 'LaTeX  4774119407' with lines 
replot "4839912653.log"  using 1:2  t 'CodeR  4839912653' with lines 
replot "4774120391.log"  using 1:2  t 'Unix   4774120391' with lines 
replot "4774120413.log"  using 1:2  t 'Raku   4774120413' with lines 
set out 'amazon.png'   
replot "4274065189.log"  using 1:2  t 'Meadow 4274065189' with lines 

amazon.com と amazon.co.jp は提供されている項目・内容が違う ということ を承知の上で → Estimating How Many Books Sold by Amazon