supp	dose	treat	mean_len	sd
OJ	0.5	OJ0.5	13.23	4.45970851065403
OJ	1	OJ1	22.7	3.91095327964367
OJ	2	OJ2	26.06	2.65505806590615
VC	0.5	VC0.5	7.98	2.74663430401646
VC	1	VC1	16.77	2.51530868439199
VC	2	VC2	26.14	4.79773094516796
