 Think of it as you've replaced a computer part, but the computer can't see it. It doesn't know the physical dimensions. It doesn't know how big. If it's a 2x4, it doesn't know if it's a 2x4, a 1x6, a 5x3. It doesn't know the physical dimensions or the internal workings of what's been replaced. So they have to put in compensation values, and that baselines the transmission so the computer can then learn