def plotMyFigureOnAxes(ax, img, cmap='Greys_r'):
    """Plot an numpy array image on a given Axes
       :ax: Matplotlib Axes object
       :img: numpy array
    """
    im = ax.imshow(img,cmap=cmap)
    fig = ax.figure

    fig.subplots_adjust(right=0.8)
    cbar_ax = fig.add_axes([0.85, 0.15, 0.05, 0.7])
    fig.colorbar(im, cax=cbar_ax)

    return ax