cluster     1   number of spheres in cluster     4
    1  17.59900  25.39400  19.54800   0.700    1                                
    2  19.09400  25.14500  19.46400   0.700    2                                
    3  19.71900  25.11700  20.62400   0.700    3                                
    4  19.57100  24.99000  18.30700   0.700    4