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This shows the results of an experiment in which Duckweed fronds—large compound leaves—were counted (second column) every week. Data from "Some accessory factors in plant growth and nutrition" by W. B. Bottomley, Proceedings of the Royal Society B, Volume 88, 1914, 237-247.

1st col	2nd col
0	20
1	30
2	52
3	77
4	135
5	211
6	326
7	550
8	1052