Help on function map in module kwant.plotter:

map(sys, value, colorbar=True, cmap=None, vmin=None, vmax=None, a=None, method='nearest', oversampling=3, num_lead_cells=0, file=None, show=True, dpi=None, fig_size=None, ax=None, pos_transform=None, background='#e0e0e0')
    Show interpolated map of a function defined for the sites of a system.
    
    Create a pixmap representation of a function of the sites of a system by
    calling `~kwant.plotter.mask_interpolate` and show this pixmap using
    matplotlib.
    
    Parameters
    ----------
    sys : kwant.system.FiniteSystem or kwant.builder.Builder
        The system for whose sites `value` is to be plotted.
    value : function or list
        Function which takes a site and returns a value if the system is a
        builder, or a list of function values for each system site of the
        finalized system.
    colorbar : bool, optional
        Whether to show a color bar if numerical data has to be plotted.
        Defaults to `True`. If `ax` is provided, the colorbar is never plotted.
    cmap : ``matplotlib`` color map or `None`
        The color map used for sites and optionally hoppings, if `None`,
        ``matplotlib`` default is used.
    vmin : float, optional
        The lower saturation limit for the colormap; values returned by
        `value` which are smaller than this will saturate
    vmax : float, optional
        The upper saturation limit for the colormap; valued returned by
        `value` which are larger than this will saturate

I hope this helps,

Adel