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Energy reflectance (ER) standard deviation (SD) values at octave frequencies for 11 ER measurements made with the same probe over the course of five months in a Zwislocki coupler (Knowles Electronics, DB-100 with DB-050 canal extension).
| Frequency(Hz) | ER SD |
|---|---|
| 250 | 0.016 |
| 500 | 0.026 |
| 1000 | 0.011 |
| 2000 | 0.026 |
| 4000 | 0.013 |
| 8000 | 0.046 |
