cluster     1   number of spheres in cluster     4
    1  -6.18400   0.58300  17.00400   0.700    1                                
    2  -7.29400   1.00200  16.51400   0.700    2                                
    3  -5.54900  -0.48800  16.51500   0.700    3                                
    4  -5.66000   1.17100  17.99900   0.700    4