cluster     1   number of spheres in cluster     4
    1  -5.53900   1.50100  13.06900   0.700    1                                
    2  -6.80300   0.87600  13.98700   0.700    2                                
    3  -5.66200   3.04400  13.70500   0.700    3                                
    4  -8.34500   0.91700  12.85700   0.700    4