cluster     1   number of spheres in cluster    21
    1 -12.87100   7.64900  17.96300   0.700    1                                
    2 -12.58700   8.92600  20.00700   0.700    2                                
    3 -13.90200   9.89000  18.11400   0.700    3                                
    4 -16.74700   7.26400  22.38700   0.700    4                                
    5 -21.41900   4.09900  17.99000   0.700    5                                
    6 -19.29500   3.02000  17.59100   0.700    6                                
    7 -22.04600   3.20000  17.13300   0.700    7                                
    8 -19.91700   2.11600  16.73400   0.700    8                                
    9 -15.84700   7.39100  18.77400   0.700    9                                
   10 -20.04400   4.02600  18.20900   0.700   10                                
   11 -21.29400   2.20000  16.50800   0.700   11                                
   12 -14.83100   8.01900  19.48200   0.700   12                                
   13 -16.74000   7.02100  19.79100   0.700   13                                
   14 -18.25200   5.43100  18.96600   0.700   14                                
   15 -13.57000   8.61800  18.88500   0.700   15                                
   16 -15.03100   8.04500  20.81500   0.700   16                                
   17 -19.47400   4.91100  19.06200   0.700   17                                
   18 -17.94100   6.37000  19.85000   0.700   18                                
   19 -16.25800   7.39200  20.98500   0.700   19                                
   20 -17.43700   5.08200  18.13000   0.700   20                                
   21 -22.06300   1.00800  15.40000   0.700   21