def set_xticks(self, row, column, ticks):
        """Manually specify the x-axis tick values.

        :param row,column: specify the subplot.
        :param ticks: list of tick values.

        """
        subplot = self.get_subplot_at(row, column)
        subplot.set_xticks(ticks)
Manually specify the x-axis tick values.

        :param row,column: specify the subplot.
        :param ticks: list of tick values.