θ is Z-axis; φ is X-axis

Pardon, but it's confusing trying to think simultaneously in terms of Pauli measurement bases and Pauli perturbations in the fixed axes of TFIM: in OTOC, θ always corresponds to Z-axis; φ always corresponds to X-axis; Z basis only ever needs θ-based corrections; X basis only ever need φ based corrections; Y axis can effectively mix both.

Full Changelog: v9.3.6...v9.3.7

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