Work with a reasonable tolerance

src/one-body-sample.parset

@@ -23,12 +23,12 @@ nu = 0.3 # Needs to be strictly below 0.5; the closer we get, the
          # tougher the problem. But we do have convergence!
 
 [solver]
-tolerance = 1e-14
+tolerance = 1e-10
 
 [solver.tnnmg]
 maxiterations = 1000000
 fixed_point_iterations = 20
-fixed_point_tolerance = 1e-14
+fixed_point_tolerance = 1e-10
 
 [solver.tnnmg.linear]
 maxiterations = 1000000