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Colormap, Heatmap
http://www.gnuplotting.org/tag/colormap/
한글 문서
https://wiki.kldp.org/KoreanDoc/html/GnuPlot-KLDP/fitting.html
Heatmap
http://www.bmsc.washington.edu/people/merritt/gnuplot/demo_canvas/heatmaps.html
http://gnuplot.sourceforge.net/demo/pm3d.html
http://jblevins.org/log/lines
http://www.gnuplotting.org/tag/linespoints/
http://www.gnuplotting.org/?s=dashed+line
http://gnuplot.sourceforge.net/demo/lines_arrows.html
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