That applies only to the type of analysis I did. Nichols's analysis uses a different technique: triangulation based on the difference in time of the same sound reaching multiple recording devices. That analysis (TDOA) only uses the muzzle blasts, which travel at the speed of sound from the rifle and ignores the supersonic shock waves. Here's a different way of visualizing that type of analysis:It seems that the point(s) (the one put up by Nichols around Crooks firing location), is based on sound interval of the rifle and the velocity of the round fired - milliseconds. The only way to change the point(s) would be a different rifle and round with a different velocity.