The RAdial Velocity Experiment (RAVE): Fourth data release by Kordopatis, G, Gilmore, G, Steinmetz, M, Boeche, C, Seabroke, G, Siebert, A, Zwitter, T, Binney, J, Laverny, P, Recio-Blanco, A, Williams, M, Piffl, T, Enke, H, Roeser, S, Bijaoui, A, Wyse, R, Freeman, K, Munari, U, Carillo, I, Anguiano, B, Burton, D, Campbell, R, Cass, C, Fiegert, K, Hartley, M