# F2 sources

This figure is a transparent deterministic calculation inherited from the v0.6 illustrative example, not an empirical source.

- Rule: `D/(10+A) ≤ 5`.
- Domain: `D in {45,60,70}` and `0 ≤ A ≤ 3`, EUR million.
- Exact boundary: `A* = D/5 - 10`; for `D=60`, `A*=2`.
- Transformation: analytical partition plus independently evaluated numerical points/intervals.
- No borrower, contract, person, product or performance observations are plotted.