2	4	4	3
[nan,nan]	[]
[0,0]	[0]
[0.5,0.9]	[0,1]
[1,1.8]	[0,1,2]
[1.5,2.7]	[0,1,2,3]
[2,3.6]	[0,1,2,3,4]
[2.5,4.5]	[0,1,2,3,4,5]
[3,5.4]	[0,1,2,3,4,5,6]
[3.5,6.3]	[0,1,2,3,4,5,6,7]
[4,7.2]	[0,1,2,3,4,5,6,7,8]
[4.5,8.1]	[0,1,2,3,4,5,6,7,8,9]
[5,9]	[0,1,2,3,4,5,6,7,8,9,10]