if (xVals == null) xVals = newInstance(maxDoc);
else xVals.ensureCapacity(maxDoc);
if (yVals == null) yVals = newInstance(maxDoc);
else yVals.ensureCapacity(maxDoc);
if (zVals == null) zVals = newInstance(maxDoc);
else zVals.ensureCapacity(maxDoc);
this._xValArray = xVals;
this._yValArray = yVals;
this._zValArray = zVals;