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Readme for the Magboltz cross sections.
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The N2 and O2 files contain respectively 
140 CSs and 158 CSs.

All the CSs come one after the others.

The format is for each: 3 lines of header 
followed by the data as following
The header contains

CS name
CS type (0:	Total, 1:	Elastic, 2:	Excitation, 3:	Ionization, 4:	Attachment, 5:	Bremsstrahlung)
CS energy threshold

And the 10000 data points containing
Energ, total cross section, 1 - \epsilon

The \epsilon is the one from the work of Okhrimovskyy (2002)
(Take care it is 1-\epsilon in the file)

It is to be used to calculate the deviation angle \Xhi after a collision by:
cos(\Xhi) = 1-2U\epsilon/(1+(1-\epsilon)*(1-2*U))

with U an uniform random number.
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To cite:

@article{BiagiWEB,
  title={Magboltz: Transport of electrons in gas mixtures},
  author={Biagi, S},
  journal={CERN program library, http://magboltz.web.cern.ch/magboltz/},
  year={2005}
}

@article{Biagi1999,
  title={{M}onte {C}arlo simulation of electron drift and diffusion in counting gases under the influence of electric and magnetic fields},
  author={Biagi, S},
  journal={Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment},
  volume={421},
  number={1},
  pages={234--240},
  year={1999},
  publisher={Elsevier}
}

@article{Okhrimovskyy2002,
  title={Electron anisotropic scattering in gases: A formula for {M}onte {C}arlo simulations},
  author={Okhrimovskyy, A and Bogaerts, A and Gijbels, R},
  journal={Physical Review E},
  volume={65},
  number={3},
  pages={037402},
  year={2002},
  publisher={APS}
}