public AreaEval offset(int relFirstRowIx, int relLastRowIx,int relFirstColIx, int relLastColIx) {if (_refEval == null) {return _areaEval.offset(relFirstRowIx, relLastRowIx, relFirstColIx, relLastColIx);}return _refEval.offset(relFirstRowIx, relLastRowIx, relFirstColIx, relLastColIx);}