It's based on the fact that particle energies follow a continuous distribution. See, for example: http://www2.astro.psu.edu/users/nnp/cr.html http://www2.astro

It's based on the fact that particle energies follow a continuous distribution. See, for example: http://www2.astro.psu.edu/users/nnp/cr.html http://www2.astro.psu.edu/users/nnp/cr.html.