'palla biliardo che cade; x: sec, y: metri (da foto)
'-0.1..0.4,-.2..1.5
8
0,0
0.05,0.12
0.10,0.26
0.15,0.43
0.20,0.62
0.25,0.84
0.30,1.08
0.35,1.35