question: private double kB ( int i ) { final double [ ] binBounds = getUpperBounds ( ) ; final RealDistribution kernel = getKernel ( binStats . get ( i ) ) ; return i == 0 ? kernel . probability ( min , binBounds [ 0 ] ) : kernel . probability ( binBounds [ i - 1 ] , binBounds [ i ] ) ; }
target:  Mass of bin i under the within-bin kernel of the bin.