  We study one-dimensional topological SN and SNS long junctions obtained by
placing a topological insulating nanowire in the proximity of either one or two
SC finite-size leads. Using the Majorana Polarization order parameter (MP)
introduced in Phys. Rev. Lett. 108, 096802 (2012)(arxiv:1109.5697) we find that
the extended Andreev bound states (ABS) of the normal part of the wire acquire
a finite MP: for a finite-size SN junction the ABS spectrum exhibits a
zero-energy extended state which carries a full Majorana fermion, while the ABS
of long SNS junctions with phase difference $\pi$ transform into two
zero-energy states carrying two Majorana fermions with the same MP. Given their
extended character inside the whole normal link, and not only close to an
interface, these Majorana-Andreev states can be directly detected in tunneling
spectroscopy experiments.
