Perturbation on which eigenstate: [0] 1st Odd [1] 1st Even [2] 2nd Even choice: 0 The perturbed energy is: 0.00558103300493999 Perturbation on which eigenstate: [0] 1st Odd [1] 1st Even [2] 2nd Even choice: 1 The perturbed energy is: 0.00803353757564506 Perturbation on which eigenstate: [0] 1st Odd [1] 1st Even [2] 2nd Even choice: 2 The perturbed energy is: 0.000435161780390274