'nth_coord = along which coordinate value varies.
nth_coord = 0 ->  x axis, nth_coord = 1 -> y axis'

def __init__(self, grid_helper, side, nth_coord_ticks=None):

    super(FixedAxisArtistHelper, self).__init__(loc=side)
    self.grid_helper = grid_helper
    if (nth_coord_ticks is None):
        nth_coord_ticks = self.nth_coord
    self.nth_coord_ticks = nth_coord_ticks
    self.side = side
    self._limits_inverted = False
