  We present an evaluation of the two master integrals for the crossed vertex
diagram with a closed loop of top quarks that allows for an easy numerical
implementation. The differential equations obeyed by the master integrals are
used to generate power series expansions centered around all the singular
points. The different series are then matched numerically with high accuracy in
intermediate points. The expansions allow a fast and precise numerical
calculation of the two master integrals in all the regions of the phase space.
A numerical routine that implements these expansions is presented.
