    # Display currently selected parts as ball and stick.

    # turn atom labels off
    LabelAtom ''

    # set atom colors to "standard" colors
    XMacStand color_atom.mac

    # select all non-pseudo atoms that were selected
    SelectAtom 'prev_sel & name != "Q*"'

    # set radius to 0.3 times VdW radius, display style to sphere
    RadiusAtom 0.3*vdw
    StyleAtom sphere

    # restore previous selection
    SelectAtom 'prev_sel'

    # display selected bonds as cylinders
    StyleBond half_cylinder