Randomly change between generating particles and anti-particles, if true. For angular resolution studies. If angres is set non-negative then for each particle generated according to the selected parameters a second particle is generated with identical properties except it is rotated angres radians in a randomly chosen direction from the direction of the original particle. Set the seed for the random number generator. If no seed is set the generator selects a seed based on the date and time, thus repeated runs will in general not give the same results.
Units are long integers.