ref: f6d97317c22b5d2e703844728a3f41b6bc3a74a4
dir: /test/plot.plt/
set terminal png size 900,400 font ',10' set bmargin 10 set output "demo.png" set nokey set style data histogram unset border set xtics rotate set xtics axis plot 'time.log' using 2:xtic(1) with boxes