public static function pixelsToCellDimension($pValue = 0, PHPExcel_Style_Font $pDefaultFont)
    {
        // Font name and size
        $name = $pDefaultFont->getName();
        $size = $pDefaultFont->getSize();

        if (isset(PHPExcel_Shared_Font::$defaultColumnWidths[$name][$size])) {
            // Exact width can be determined
            $colWidth = $pValue * PHPExcel_Shared_Font::$defaultColumnWidths[$name][$size]['width'] / PHPExcel_Shared_Font::$defaultColumnWidths[$name][$size]['px'];
        } else {
            // We don't have data for this particular font and size, use approximation by
            // extrapolating from Calibri 11
            $colWidth = $pValue * 11 * PHPExcel_Shared_Font::$defaultColumnWidths['Calibri'][11]['width'] / PHPExcel_Shared_Font::$defaultColumnWidths['Calibri'][11]['px'] / $size;
        }

        return $colWidth;
    }