This is an example for re-creating gnuplot charts with tikz on LaTeX, made possible by adding gnuplot-lua-tikz.sty and gnuplot-lua-tikz-common.tex to your project. (These files can be generated by invoking lua gnuplot-tikz.lua style where gnuplot-tikz.lua can be found in $GNUPLOT/lua/gnuplot-tikz.lua.
(This will work with all engines, not just LuaLaTeX!)
A minimal example of rotated text in LaTeX. All you need is
in the preamble, and
around the text you wish to rotate (in this case, by an angle of 45 degrees).
This example was originally posted at: http://texblog.org/2013/10/01/rotate-an-image-table-or-paragraph-in-latex/