One file for each Bs decay channel (B_s^0 \to D_s^- \pi^+ and B_s^0 \to J/\psi \phi) and each year (2016-2018) so 6 in total @adavis @gersabec
B_s^0 \to D_s^- \pi^+
B_s^0 \to J/\psi \phi