Filled contour plot of 2d DataArray

    Wraps :func:`matplotlib:matplotlib.pyplot.contourf`

def contourf(x, y, z, ax, **kwargs):
    """
    Filled contour plot of 2d DataArray

    Wraps :func:`matplotlib:matplotlib.pyplot.contourf`
    """
    primitive = ax.contourf(x, y, z, **kwargs)
    return primitive