Description: To learn more about what happened in the last experiment, an NRR group-wise stage was divided into 4: level 2, 5 knot-points; level 2, 2 knot-points; level 1, 4 knot-points; level 1, 2 knot-points.
Intent: Seeing what it is that make the algorithm 'behave' and what it is that harms its operation.
Results: The exacerbation is no longer as bad, but it is there and it prevents, at all levels, registration from being reached. In fact, one of the two brains shrinks.