Cluster	Lower bound	Upper bound
]-inf;18.5]		18.5
]18.5;23.5]	18.5	23.5
]23.5;29.5]	23.5	29.5
]29.5;40.5]	29.5	40.5
]40.5;59.5]	40.5	59.5
]59.5;+inf[	59.5	
