Issue I440 [80,defect,fly2,resolved] KE precision error when defining very low speed or momentum in FLY2. Prior to 8.0.4-TEST16, if in FLY2 file "velocity format" was defined as "direction+speed" and v/c was small (< about 10^-7), where v is particle speed and c is speed of light, then particle KE can be off significantly (> about 3%). The FLY2 code was using a full relativistic calculation for converting speed to KE, and that calculation lacked numerical precision at very low v/c. This defect does not affect other parts of SIMION (e.g. speed_to_ke function). As of 8.0.4-TEST16, the FLY2 code uses the built-in speed_to_ke function, which doesn't have this precision problem. Similarly, prior to 8.0.4-TEST14, if in FLY2 file "velocity format" was defined as "direction+momentum" and momentum/mass was small (< about 10^-4), where momentum in units of MeV/c and mass in units of u, then particle KE can be off significantly (> about 1%). Affects 8.0.0-8.0.4-TEST15. Resolved in 8.0.4-TEST16.