| Figure 3: Tau lepton-flavour-violating branching fraction upper limits
combinations summary plot. For each channel we report the HFLAV
combined limit, and the experimental published limits. In some cases,
the combined limit is weaker than the limit published by a single
experiment. This arises since the CLs method used in the
combination can be more conservative compared to other legitimate
methods, especially when the number of observed events fluctuates below the
expected background.
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