You can look this up. The short story... These are the 'critical bands' of human hearing. First 24 anyway. They are based on studies of how our ears actually function. Complimentary to Fletcher-Munson so to speak. Why you might want to know. Masking, Arrangement, Loudness perception. The info is pretty easy to find. The basics and things you might want to become aware of. Instruments, voices, what have you inside a critical band, have a very good chance of masking one another. Think Kick and Bass, Vocal and Guitar, Synth and anything. Can you alter your arrangement? Can you choose a different kick? 1/3 Octave filtering is often used to cure masking within a band. Something to learn here. If your 1/3 Octave filter looks like an upside down V in theory.... the reality is sonically the left side, the bass side will be more impactful. So if your upside down V was divided in half, the right side might be 15 degrees but the left side might be 25 degrees audibly. A lopsided upside down V. This is not visual it is again how our ears work. Short and long tone sounds will fool you as to what is loudest. High and low tones will do the same. If you have a sound with some low information and higher pitched but shorter sounds just before and after, they can be masked. These are happening in the ms range. Finally these bands are not carved in stone. if you are on a band edge it doesn't mean your kick and bass are magically going to work because they technically sit in two different bands. If they are close to one another you will still be very interested about masking depending on what the sounds of your instruments are delivering. Anyway, rather than charts showing you low, low mid, mid, etc, etc. you will be able to find something in your music that is directly tied to how the human ear works. Or at least how scientists have determined. Look up some documents, vids, books on critical bands, psychoacoustics, masking, loudness perception. The chart is very basic and very easy to understand. The numbers in the Octave list don't add up perfectly. It doesn't matter. This is not about go to this number and you can fix things. This is about hearing. Music is all about hearing.