<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def name(self):
 """ The string label given to this series, appears as the title of the column for this series in the Excel worksheet. It also appears as the label for this series in the legend. """

        names = self._element.xpath('./c:tx//c:pt/c:v/text()')
        name = names[0] if names else ''
        return name