This means the same cup volume is used across band sizes . Please see the grid below, all of the same colour diagonal boxes have identical cup volume just a different band size.
All of the white boxes from 42A to 28FF have identical cup volume just a different band size. (Hard to believe we know, but it’s true!)
When you increase the band size, in order to keep the same cup volume, the letter goes down.
When you need a smaller band, to keep the same cup volume, you go up a letter.
Let’s park this for now, we will come back to it
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