I intentionally left it out -- it would have made the email too long. The fact that it's valuable, I think, is obvious (450 tanks versus 1400). How valuable? Not as important.

For the same reason, I also left out that the Allies used the same mathematical tools to estimate supply lines. If you're seeing a "rate of production" in Berlin of 100 units/mo, and for the same unit type, only 25 units/mo in Paris, that's probably evidence that it's taking a really long time for that unit to get to Paris.