  We present a calculation of the continuum part of the gamma-ray spectra
resulting from Dark Matter annihilation in the framework of the MSSM taking
into account Sommerfeld effects. Concentrating on pure wino and pure higgsino
scenarios we compare our calculation to existing work and explore the numerical
impact of the features not captured by previous approximative descriptions. We
find that, in particular for large neutralino masses, when the Sommerfeld
enhancement is very large, chargino-antichargino annihilation processes, which
have not been considered before, lead to sizable differences with respect to
existing calculations. In scenarios with neutralinos in the intermediate-mass
range, we find that the role of the charginos is crucial in the endpoint
regime. Our calculation provides the currently most accurate prediction for the
continuum gamma-ray spectra.
