I have attached an image of my bitloading graph. There is a large chunk of upstream tones missing (from about 2030 to 2800). What I don't understand is that there are useable downstream tones above that (2800 to 3100) which are at a higher frequency. Given the approximate shape of the graph, where the y-axis decreases with frequency (as expected), I would have thought there would be more useable tones in that missing chunk, given there are useable tones at a higher frequency. Does anyone have any idea of why that would be? Does anyone else have a similar bitloading graph with chunks missing? Just curious.