Data for Zhang, P., Maldonis, J. J., Besser, M. F., Kramer, M. J. & Voyles, P. M. "Medium-range structure and glass forming ability in Zr–Cu–Al bulk metallic glasses" Acta Mater. 109, 103–114 (2016). DOI: 10.1016/j.actamat.2016.02.006. Includes variable-resolution fluctuation electron microscopy raw data and analysis and hybrid reverse Monte Carlo derived atomic structural models and related analyses.