def setup_cellview(ax, system, scale=1):
    """Builds the particle position visualisation pane.

    Parameters
    ----------
    ax: Axes object
        The axes position that the pane should be placed in.
    system: System
        The whole system information.
    scale: float (optional)
        The amount by which the particle size should be scaled down.
    """
    xpos = system.particles['xposition']
    ypos = system.particles['yposition']
    mk = 6.00555e-08 / (system.box_length - 2.2727e-10) - 1e-10 / scale
    ax.plot(xpos, ypos, 'o', markersize=mk, markeredgecolor='black', color=
        '#34a5daff')
    ax.set_xlim([0, system.box_length])
    ax.set_ylim([0, system.box_length])
    ax.set_xticks([])
    ax.set_yticks([])
