code: function parse_PtgArray(blob, length, opts) {
  	var type = (blob[blob.l++] & 0x60) >> 5;
  	blob.l += opts.biff == 2 ? 6 : opts.biff == 12 ? 14 : 7;
  	return [type];
  }
docs: /* [MS-XLS] 2.5.198.32 ; [MS-XLSB] 2.5.97.23