Protocols for x-ray transient grating pump/optical probe experiments at x-ray free electron lasers - Fainozzi, D; Cucini, R; Vila-Comamala, J; Lima, F; Ardana-Lamas, F; Bañares, L; Bargheer, M; Bencivenga, F; Berndt, N; Beye, M; Biednov, M; Bonetti, S; et al. (Journal Of Physics B: Atomic, Molecular And Optical Physics, 2024)