cache.setPointCount(numOfPoints);
Workbook wb = marker.getSheet().getWorkbook();
FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();
CellWalk cellWalk = new CellWalk(marker);
NumCacheCellHandler numCacheHandler = cache.new NumCacheCellHandler(evaluator);
cellWalk.traverse(numCacheHandler);
return cache;
}