Editing Forster distance calculator (section)

== How the script works ==
* The script integrate the Donor emission spectre, to divide with it.
*: This is done by simple numerical integration by the [http://en.wikipedia.org/wiki/Rectangle_method Rectangle method]
* All datapoints for the Acceptor excitation spectre are scaled, so that '''e'''(molar extinction coefficient) fits the wavelength where it is determined.
* For the multiplication of the spectre, the script test that both data points exist before multiplication.
*: This can be troublesome, if there is 1-2 nm between each data point. Or if they are "un-even". Like Donor has 100.2 100.4 100.4 and Acceptor has 100.1 100.3 100.5
*: But most spectre have much better resolution. Mostly 0.2 nm, and "even spaced"
*: So this should work quite good as well.

The output is a text file, with all the datapoints.
# Column: Donor: The input Emission wavelength.
# Column: Donor: The input Emission, arbitrary units of excitation.
# Column: Donor: The input Emission, arbitrary units of excitation, divided by the integrated area.
# Column: Acceptor: The input excitation wavelength.
# Column: Acceptor: The input excitation '''e'''(molar extinction coefficient).
# Column: Acceptor: The input excitation '''e'''(molar extinction coefficient), scaled correctly.
# Column: The calculated overlap for this datapoint.
# Column: The summed values for calculated overlap, until this datapoint.


It also automatically generates a [http://www.gnuplot.info/ gnuplot] .plt file, for super fast making graphs of the spectres. In linux, gnuplot is normally part of the installation. Just write: gnuplot FILENAME.plt
If you are in windows, [http://sourceforge.net/projects/gnuplot/files/ download gnuplot] and open the .plt file. 

Gnuplot makes three graphs in .eps format. They can be converted to pdf with the program: epstopdf or eps2pdf. They are for example part of LaTeX: C:\Program Files (x86)\MiKTeX 2.9\miktex\bin or you can [http://tinyurl.com/eps2pdf download it here]. The format of .eps is choses, since gnuplot then allows for math symbols in the graphs.
<gallery heights="240px" widths="340px">
Image:1-ALEXA488Emi-ALEXA633Exi-overlap-all-spectre.png|All graphs plotted together, but not scaled correctly.
Image:2-ALEXA488Emi-ALEXA633Exi-overlap-normalized-spectre.png|The Donor emission (y1) and Acceptor excitation (y2) scaled correctly.
Image:3-ALEXA488Emi-ALEXA633Exi-overlap-integral.png|The Rectangle integral datapoint (y1) and the summed integration (y2).
</gallery>