== ring L=64: |X| = 64, l0 = Lambda^+(x,x) = 5.332031, omega_1 = 0.009631, l0 |X| omega_1 = 3.286, 33 separations
   (4.18): max relative residual (|lhs - rhs| / sum of |terms|) at the exact lowest eigenvalue = 7.6e-13 (couplings from (0.01,0.02) to (-10,-10))
   eta     g1         g2        r2        4eta/(1-eta)   r3        4eta^2/(1-eta)
   0.05   5.861e-04  5.861e-04  7.46e-03  2.11e-01       3.11e-05  1.05e-02  ok
   0.05   5.861e-04 -2.930e-04  1.87e-03  2.11e-01       4.45e-06  1.05e-02  ok
   0.05  -5.861e-04 -1.954e-04  5.01e-03  2.11e-01       1.44e-05  1.05e-02  ok
   0.25   2.930e-03  2.930e-03  3.67e-02  1.33e+00       7.73e-04  3.33e-01  ok
   0.25   2.930e-03 -1.465e-03  9.26e-03  1.33e+00       1.11e-04  3.33e-01  ok
   0.25  -2.930e-03 -9.768e-04  2.53e-02  1.33e+00       3.60e-04  3.33e-01  ok
   0.50   5.861e-03  5.861e-03  7.19e-02  4.00e+00       3.07e-03  2.00e+00  ok
   0.50   5.861e-03 -2.930e-03  1.83e-02  4.00e+00       4.42e-04  2.00e+00  ok
   0.50  -5.861e-03 -1.954e-03  5.14e-02  4.00e+00       1.45e-03  2.00e+00  ok
   0.90   1.055e-02  1.055e-02  1.25e-01  3.60e+01       9.81e-03  3.24e+01  ok
   0.90   1.055e-02 -5.275e-03  3.23e-02  3.60e+01       1.43e-03  3.24e+01  ok
   0.90  -1.055e-02 -3.516e-03  9.46e-02  3.60e+01       4.71e-03  3.24e+01  ok
== square torus L=16: |X| = 256, l0 = Lambda^+(x,x) = 0.489924, omega_1 = 0.152241, l0 |X| omega_1 = 19.094, 45 separations
   (4.18): max relative residual (|lhs - rhs| / sum of |terms|) at the exact lowest eigenvalue = 5.2e-12 (couplings from (0.01,0.02) to (-10,-10))
   eta     g1         g2        r2        4eta/(1-eta)   r3        4eta^2/(1-eta)
   0.05   6.379e-03  6.379e-03  9.15e-03  2.11e-01       6.45e-05  1.05e-02  ok
   0.05   6.379e-03 -3.189e-03  2.29e-03  2.11e-01       9.25e-06  1.05e-02  ok
   0.05  -6.379e-03 -2.126e-03  6.17e-03  2.11e-01       3.00e-05  1.05e-02  ok
   0.25   3.189e-02  3.189e-02  4.45e-02  1.33e+00       1.57e-03  3.33e-01  ok
   0.25   3.189e-02 -1.595e-02  1.13e-02  1.33e+00       2.29e-04  3.33e-01  ok
   0.25  -3.189e-02 -1.063e-02  3.15e-02  1.33e+00       7.64e-04  3.33e-01  ok
   0.50   6.379e-02  6.379e-02  8.60e-02  4.00e+00       6.10e-03  2.00e+00  ok
   0.50   6.379e-02 -3.189e-02  2.21e-02  4.00e+00       9.02e-04  2.00e+00  ok
   0.50  -6.379e-02 -2.126e-02  6.46e-02  4.00e+00       3.13e-03  2.00e+00  ok
   0.90   1.148e-01  1.148e-01  1.47e-01  3.60e+01       1.89e-02  3.24e+01  ok
   0.90   1.148e-01 -5.741e-02  3.86e-02  3.60e+01       2.86e-03  3.24e+01  ok
   0.90  -1.148e-01 -3.827e-02  1.21e-01  3.60e+01       1.05e-02  3.24e+01  ok
== cubic torus L=8: |X| = 512, l0 = Lambda^+(x,x) = 0.224606, omega_1 = 0.585786, l0 |X| omega_1 = 67.364, 35 separations
   (4.18): max relative residual (|lhs - rhs| / sum of |terms|) at the exact lowest eigenvalue = 2.7e-11 (couplings from (0.01,0.02) to (-10,-10))
   eta     g1         g2        r2        4eta/(1-eta)   r3        4eta^2/(1-eta)
   0.05   1.391e-02  1.391e-02  9.27e-03  2.11e-01       6.72e-05  1.05e-02  ok
   0.05   1.391e-02 -6.957e-03  2.33e-03  2.11e-01       9.61e-06  1.05e-02  ok
   0.05  -1.391e-02 -4.638e-03  6.26e-03  2.11e-01       3.13e-05  1.05e-02  ok
   0.25   6.957e-02  6.957e-02  4.51e-02  1.33e+00       1.64e-03  3.33e-01  ok
   0.25   6.957e-02 -3.478e-02  1.14e-02  1.33e+00       2.38e-04  3.33e-01  ok
   0.25  -6.957e-02 -2.319e-02  3.19e-02  1.33e+00       7.96e-04  3.33e-01  ok
   0.50   1.391e-01  1.391e-01  8.71e-02  4.00e+00       6.34e-03  2.00e+00  ok
   0.50   1.391e-01 -6.957e-02  2.24e-02  4.00e+00       9.39e-04  2.00e+00  ok
   0.50  -1.391e-01 -4.638e-02  6.55e-02  4.00e+00       3.26e-03  2.00e+00  ok
   0.90   2.504e-01  2.504e-01  1.49e-01  3.60e+01       1.96e-02  3.24e+01  ok
   0.90   2.504e-01 -1.252e-01  3.91e-02  3.60e+01       2.98e-03  3.24e+01  ok
   0.90  -2.504e-01 -8.348e-02  1.23e-01  3.60e+01       1.10e-02  3.24e+01  ok

Ring L=4, g=(1,-1/2), d=2: exact delta = -1.74e-16; right side of (4.18) at delta=0: 5.55e-16