require fix in the simulator for perfect values of the coupling constants

Because of highlighted problem in the simulator, the values of the couplings are not perfect yet.

The issue does not name a file, test, entry point, or the highlighted simulator problem. Start by locating the simulator and the code that calculates coupling constants, then identify the expected perfect values and reproduce the discrepancy. Done means the simulator produces the intended coupling values, with a test or other verification if the project provides one.

Written by the indexing model from the issue text.