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In this experiment 144 seven-month-old rats were observed over a period of 30 months. The cumulative number that died (second column) was recorded every month (first column). For more details, see "Growth and Diffusion Phenomena" by R.B. Banks, Springer-Verlag, 1994, page 222.

1st col	2nd col
1	1
2	1
3	3
4	5
5	6
6	7
7	8
8	13
9	22
10	26
11	30
12	36
13	47
14	54
15	64
16	74
17	89
18	94
19	96
20	108
21	114
22	115
23	122
24	125
25	133
26	136
27	139
28	141
29	141
30	142