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+====== GnuPlot ======
+GnuPlot is the ultimate plotting tool and very powerful which has the downside
+of being quite hard to use especially for new users. Hopefully this article
+clears things up a bit (for me at least).
+===== Plotting =====
+Probably the most common task performed when using a plotting tool is ...
+plotting! Here are a few examples:
+Plotting a function:
+  gnuplot> plot f(x) = x**2, f(x)
+The same as above, but giving the range to plot:
+  gnuplot> plot [-5:5] f(x) = x**2, f(x)
+Plotting two functions in the same plot:
+  gnuplot> plot f(x) = x**2, g(x) = x**3, f(x), g(x)
+==== Data Files ====
+First, generate some data:
+  $ ping nwl.cc | sed -un 's/.*time=\(.*\) ms/\1/p' >/tmp/data
+The output looks like this:
+<file /tmp/data>
+.8
+.7
+.2
+.2
+.0
+.3
+.2
+.9
+.6
+...
+</file>
+Now plot it:
+  gnuplot> plot '/tmp/data' with lines
+===== Output To File =====
+File output is configured by setting a different terminal than the default
+''x11'' for the file type to generate and setting the ''output'' variable for
+the filename:
+  gnuplot> set terminal png size 800,600
+  gnuplot> set output '/tmp/data.png'
+Afterwards the output of any ''plot'' command will be written to
+///tmp/data.png// in ''png'' format.
+Creating PDFs works equvalently, but the ''size'' parameter is interpreted
+differently (inches instead of pixels):
+  gnuplot> set terminal pdf size 8,6
+  gnuplot> set output '/tmp/data.pdf'
+But it gets even better, latex output:
+  gnuplot> set terminal latex size 8,6
+  gnuplot> set output '/tmp/data.tex'
+There are various output formats available, one may even chose between
+different latex packages to use. For reference, see the output of ''set
+terminal'' without further parameters.