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The CHARM II result was inadvertently misrepresented in Fig. 11. The corrected figure is given below.
Limits at the 95% CL on the mixing matrix element |U|2 as a function of the vm mass for the various experiments referenced in the text. The limits shown for the present analysis correspond to those obtained combining the short-lived and long-lived vm analysis
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The online version of the original article can be found at https://doi.org/10.1007/s002880050370
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DELPHI Collaboration. Erratum to Search for neutral heavy leptons produced in Z decays. Z Phys C - Particles and Fields 75, 580 (1997). https://doi.org/10.1007/BF03546181
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DOI: https://doi.org/10.1007/BF03546181