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Conductance at zero source-drain voltage bias in InSb nanowire/NbTiNsuperconductor devices exhibits peaks that are close to a quantized value of$2e^2/h$. The nearly quantized resonances evolve in the tunnel barrierstrength, magnetic field and magnetic field orientation in a way consistentwith Majorana zero modes. Our devices feature two tunnel probes on both ends ofthe nanowire separated by a 400 nm nanowire segment covered by thesuperconductor. We only find nearly quantized zero bias peaks localized to oneend of the nanowire, while conductance dips are observed for the sameparameters on the other end. This undermines the Majorana explanation asMajorana modes must come in pairs. We do identify states delocalized from endto end near zero magnetic field and at higher electron density, which is not inthe basic Majorana regime. We lay out procedures for assessing the nonlocalityof subgap wavefunctions and provide a classification of nanowire bound statesbased on their localization.

Non-Majorana states yield nearly quantized conductance in superconductor-semiconductor nanowire devices