<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _plot(self):
 """Draw bars for series and secondary series"""

        for serie in self.series[::-1 if self.stack_from_top else 1]:
            self.bar(serie)
        for serie in self.secondary_series[::-1 if self.stack_from_top else 1]:
            self.bar(serie, True)