%f (Hz)	T20 (s)
80	1.6216
100	1.854
125	1.5627
155	1.5712
200	1.5926
250	1.4969
315	1.4204
400	1.3433
500	1.2584
630	1.2679
800	1.2955
1000	1.3415
1250	1.3803
1600	1.4239
2000	1.3197
2500	1.2468
3150	1.1644
4000	1.0488
5000	0.95336
6350	0.85682
8000	0.7193
10000	0.57024
12500	0.43444
16000	0.33581