(1) 1/(1-e^-2) = 1.1565176427496657
    sigma 24: A_Q/A_rec = 1.1551951875
    sigma 40: A_Q/A_rec = 1.1558005158
    sigma 80: A_Q/A_rec = 1.1561888528
    sigma 640: A_Q/A_rec = 1.1564799045
    omegad*amp*A_rec/pi - 1 over 777 qubits: max |.| = 1.18e-07, median -1.07e-09
(2) Hc == (QQ+PP)/2: True
    twirl == QQ/2: True ; eigenvalues of Q: [-1.7321  0.      1.7321]
    logical block at T = pi/6: unitary True, relative phases/pi = [ 0.   0.5  0.5 -0. ] (ZZ-type: CZ up to local Z iff phases ~ (0, a, b, a+b+-1))
    p2 of extreme eigenvectors: 0.333333 0.333333 ; outside-qubit population of a code state: 0.555556
(3)  d   lower=pi/(4 kappa)  upper=pi/(2 lambda^2)  ratio
      2   0.785398            1.570796             2.0000
      3   0.392699            0.523599             1.3333
      4   0.226725            0.288246             1.2713
      5   0.160319            0.192446             1.2004
     10   0.060939            0.066519             1.0916
     20   0.025699            0.027059             1.0529