protected void initializeBspf() {
if (bspf == null) {
if (showRebondTimes && Logger.debugging)
Logger.startTimer();
bspf = new Bspf(3);
/* if (MIX_BSPT_ORDER) {
Logger.debug("mixing bspt order");
int stride = 3;
int step = (atomCount + stride - 1) / stride;
for (int i = 0; i < step; ++i)