  Recent X-ray studies have shown that supernova shock models are unable to
satisfactorily explain X-ray emission in the rim of the Cygnus Loop. In an
attempt to account for this anomalously enhanced X-ray flux, we fit the region
with a model including theoretical charge exchange (CX) data along with shock
and background X-ray models. The model includes the CX collisions of $O^{8+}$,
$O{7+}$, $N^{7+}$, $N^{6+}$, $C^{6+}$, and $C^{5+}$ with H with an energy of 1
keV/u (438 km/s). The observations reveal a strong emission feature near 0.7
keV that cannot fully be accounted for by a shock model, nor the current CX
data. Inclusion of CX, specifically $O^{7+} + H$, does provide for a
statistically significant improvement over a pure shock model.
