  We investigate theoretically the formation of two-component light with
superluminal group velocity in a medium controlled by four Raman pump fields.
In such an optical scheme only a particular combination of the probe fields is
coupled to the matter and exhibits superluminal propagation, the orthogonal
combination is uncoupled. The individual probe fields do not have a definite
group velocity in the medium. Calculations demonstrate that this superluminal
component experiences an envelope advancement in the medium with respect to the
propagation in vacuum.
