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