C.f. https://github.com/simonsobs-uk/data-centre/issues/43, #738. This may be the reason that this test is failing when no. of MPI processes is great than 4: https://github.com/hpc4cmb/toast/blob/toast3/src/toast/tests/observation.py?rgh-link-date=2024-02-29T11%3A28%3A46Z#L35
C.f. simonsobs-uk/data-centre#43, #738.
This may be the reason that this test is failing when no. of MPI processes is great than 4: https://github.com/hpc4cmb/toast/blob/toast3/src/toast/tests/observation.py?rgh-link-date=2024-02-29T11%3A28%3A46Z#L35