cluster     1   number of spheres in cluster     4
    1  42.51800  21.88400  54.02100   0.700    1                                
    5  40.96700  21.30100  52.24400   0.700    5                                
    6  41.20000  21.83200  53.56100   0.700    6                                
    7  40.54600  23.29500  53.68300   0.700    7