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Description
I made a slice in ParaView of number densities from the punc++/test
simulation and it ranged from 0 to 44. Certainly this is not physical, since the background number density is 1e10. I believe this must be the density of simulation particles then. It would be better to output the physical number density, which is obtained by multiplying by the statistical weight (i.e. ratio of physical to simulation particles). I am not entirely sure how to do this in a good way. We do not store the statistical weight, and it might be different for different species. For sure, it's just one number, so it could be saved in Species
during its construction.