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This shows the amplitude in cms (second column) at various times in seconds (first column) for an underdamped pendulum. Data from "Spreadsheets in the Physics Laboratory" by M. E. Krieger and J. H. Stith, The Physics Teacher, September 1990, 378-384, Table II.

1st col	2nd col
0.0	10.0
16.7	9.6
33.0	9.0
49.5	8.4
66.1	7.7
82.6	7.1
99.1	6.3
116.2	5.7
132.1	5.5
149.3	5.1
165.8	4.8