Evolution of Semilocal String Networks: II. Velocity estimators
  We continue a comprehensive numerical study of semilocal string networks and
their cosmological evolution. These can be thought of as hybrid networks
comprised of (non-topological) string segments, whose core structure is similar
to that of Abelian Higgs vortices, and whose ends have long--range interactions
and behaviour similar to that of global monopoles. Our study provides further
evidence of a linear scaling regime, already reported in previous studies, for
the typical length scale and velocity of the network. We introduce a new
algorithm to identify the position of the segment cores. This allows us to
determine the length and velocity of each individual segment and follow their
evolution in time. We study the statistical distribution of segment lengths and
velocities for radiation- and matter-dominated evolution in the regime where
the strings are stable. Our segment detection algorithm gives higher length
values than previous studies based on indirect detection methods. The
statistical distribution shows no evidence of (anti)correlation between the
speed and the length of the segments.
