public function _savePps(&$raList)
    {
        // Save each PPS WK
        $iC = count($raList);
        for ($i = 0; $i < $iC; ++$i) {
            fwrite($this->fileHandle, $raList[$i]->_getPpsWk());
        }
        // Adjust for Block
        $iCnt = count($raList);
        $iBCnt = $this->bigBlockSize / OLE::OLE_PPS_SIZE;
        if ($iCnt % $iBCnt) {
            fwrite($this->fileHandle, str_repeat("\x00", ($iBCnt - ($iCnt % $iBCnt)) * OLE::OLE_PPS_SIZE));
        }
    }