My bone conduction (BC) tests never seem to exceed 4 kHz. My first diagram indicates bone conduction on 250, 500, 1k, 1.5k, 2k, 3k, 4k. The second diagram from the second test indicates BC at 250, 500, 1k, 1.8k?, 2k, 3k?, 4k. (The frequency was a bit harder to read on the second diagram, but...