Near perfect agreement is achieved in every case. In particular, absolute differences between the two calculations-which yield an estimate of the TDQT error-is always found to be less than the maximum expected value of ∆P max T = 1/n. For the Eckart PES problems, this value is ∆P max T = 2.5 × 10 -3 ; for the potential ramp problem, it is 3.3 × 10 -3 .