  We present measurements of Collins asymmetries in the inclusive process e+e-
-->pi pi X, where pi stands for charged pions, at a center-of-mass energy of
10.6 GeV. We use a data sample of 468 fb-1 collected by the BABAR experiment at
the PEP-II B factory at SLAC, and consider pairs of charged pions produced in
opposite hemispheres of hadronic events. We observe clear asymmetries in the
distributions of the azimuthal angles in two distinct reference frames. We
study the dependence of the asymmetry on several kinematic variables, finding
that it increases with increasing pion momentum and momentum transverse to the
analysis axis, and with increasing angle between the thrust and beam axis.
