  We demonstrate the power of the local correlation tracking technique on
stellar data for the first time. We recover the spot migration pattern of the
long-period RS CVn-type binary $\sigma$ Gem from a set of six Doppler images
from 3.6 consecutive rotation cycles. The resulting surface flow map suggests a
weak anti-solar differential rotation with $\alpha\approx-0.0022\pm0.0016$, and
a coherent poleward spot migration with an average velocity of $220\pm10$ m
s$^{-1}$. This result agrees with our recent findings from another study and
could also be confirmed theoretically.
