“…From section 3.2 we expect the following order for the order n = 4 schemes from least to most efficient, that is from largest to smallest asymptotic error: Forest-Ruth (31), Suzuki (38), Omelyan's Forest-Ruth-type (33), uniform non-unitary (44), Blanes and Moan (46), our optimised 4th order (40), non-unitary (q = 4) (36), and non-unitary (q = 5) (42). Furthermore we expect large gaps between Forest-Ruth, the other unitary schemes, and the non-unitary schemes.…”