Set x-axis limits of specified subplots.

        :param row_column_list: a list containing (row, column) tuples to
            specify the subplots, or None to indicate *all* subplots.
        :type row_column_list: list or None
        :param min: minimal axis value
        :param max: maximum axis value

def set_xlimits_for_all(self, row_column_list=None, min=None, max=None):
        """Set x-axis limits of specified subplots.

        :param row_column_list: a list containing (row, column) tuples to
            specify the subplots, or None to indicate *all* subplots.
        :type row_column_list: list or None
        :param min: minimal axis value
        :param max: maximum axis value

        """
        if row_column_list is None:
            self.limits['xmin'] = min
            self.limits['xmax'] = max
        else:
            for row, column in row_column_list:
                self.set_xlimits(row, column, min, max)