    # Display bundle of structures as "sausage"
    # (spline with variable radius).

    # store current selection
    DefPropMol 'prev_sel' 'selected'
    DefPropRes 'prev_sel' 'selected'
    DefPropAtom 'prev_sel' 'selected'

    # calculate mean structure, setting B-factor of atoms in
    # mean structure to average displacement
    MeanMol "mean" avg_disp mean_only

    # unset helix and sheet properties for all residues in
    # mean structure, we want to add a simple spline, not a
    # schematic display of secondary structure
    SelectRes 'mol.name = "mean"'
    DefPropRes 'helix' '0'
    DefPropRes 'sheet' '0'

    # select CA atoms of mean structure
    SelectAtom 'mol.name = "mean" & name = "CA"'

    # set atom radius (which will be used as spline radius)
    # to the B-factor, which was calculated as average
    # displacement to the mean structure
    RadiusAtom bfactor

    # add the spline
    AddRibbon

    # use atom radius as spline radius
    StyleRibbon as_is as_is as_is atom

    # restore old selection, with newly created spline added
    SelectMol 'prev_sel | name = "mean"'
    SelectRes 'prev_sel | mol.name = "mean"'
    SelectAtom 'prev_sel | mol.name = "mean"'