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... After un-blinding, the total number of events observed in the signal region was 6. The upper limit of the B 0 s → µ + µ − branching fraction was extracted using a standard implementation [11,12] of the CLs method [13]. Figure 1 shows the invariant-mass distribution and the behaviour of the observed CLs for different tested values of the B(B 0 s → µ + µ − ). ...