public function writeFont()
	{
		$font_outline = 0;
		$font_shadow = 0;

		$icv = $this->_colorIndex; // Index to color palette
		if ($this->_font->getSuperScript()) {
			$sss = 1;
		} else if ($this->_font->getSubScript()) {
			$sss = 2;
		} else {
			$sss = 0;
		}
		$bFamily = 0; // Font family
		$bCharSet = PHPExcel_Shared_Font::getCharsetFromFontName($this->_font->getName()); // Character set

		$record = 0x31;		// Record identifier
		$reserved = 0x00;	// Reserved
		$grbit = 0x00;		// Font attributes
		if ($this->_font->getItalic()) {
			$grbit |= 0x02;
		}
		if ($this->_font->getStrikethrough()) {
			$grbit |= 0x08;
		}
		if ($font_outline) {
			$grbit |= 0x10;
		}
		if ($font_shadow) {
			$grbit |= 0x20;
		}

		$data = pack("vvvvvCCCC",
			$this->_font->getSize() * 20,						//	Fontsize (in twips)
			$grbit,
			$icv,												//	Colour
			self::_mapBold($this->_font->getBold()),			//	Font weight
			$sss,												//	Superscript/Subscript
			self::_mapUnderline($this->_font->getUnderline()),
			$bFamily,
			$bCharSet,
			$reserved
		);
		$data .= PHPExcel_Shared_String::UTF8toBIFF8UnicodeShort($this->_font->getName());

		$length = strlen($data);
		$header = pack("vv", $record, $length);

		return($header . $data);
	}