The base-bleed solution yields a more consistent ballistic trajectory, which reduces the Range Probable Error or RPE . ( See also Circular Error Probable . ) The XM1128 uses the M864's " base burn " or " base bleed " assembly, this booster must continue to burn at least until the round exits the barrel to obtain consistent RPE.
22.
Where " x " 0 is the location parameter, specifying the location of the peak of the distribution, and ? is the scale parameter which specifies the half-width at half-maximum ( HWHM ), alternatively 2? is full width at half maximum ( FWHM ) . ? is also equal to half the interquartile range and is sometimes called the probable error.
