Higher-order asymptotic corrections and their application to the Gamma Variance Model Enzo Canonero, Alessandra Rosalba Brazzale and Glen Cowan Eur. Phys. J. C, 83 12 (2023) 1100 Published online: 03 December 2023 DOI: 10.1140/epjc/s10052-023-12263-7