cluster     1   number of spheres in cluster     4
    1  16.66900  -4.19600  58.09600   0.700    1                                
    2  15.77600  -5.43100  58.16200   0.700    2                                
    3  17.24600  -4.01200  56.80000   0.700    3                                
    4  14.27900  -5.28500  59.19500   0.700    4