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This shows the concentration of theophylline in the blood stream in mg/l (second column) as a function of time in hours (first column) after injection of a 300 mg initial dose given to a subject weighing 50 kg. Data from "Applying Mathematics" by D.N. Burghes, I. Huntley, and J. McDonald, Ellis Horwood 1982, page 125.

1st col	2nd col
0	12.0
1	10.0
3	7.0
5	5.0
7	3.5
9	2.5
11	2.0
13	1.5
15	1.0
17	0.7
19	0.5