  We give some necessary and sufficient conditions for the existence of
N\'{e}ron models of jacobians of semistable morphisms of arbitrary relative
dimension over base schemes of arbitrary dimension. To do this, we introduce a
notion of alignment for semistable morphisms over any regular base scheme, and
show that the jacobian of an aligned projective semistable morphism admits a
separated model with the N\'{e}ron mapping property. When the Picard scheme is
smooth over the base scheme along its unit section we show that the converse
holds.
