  4U 1705-44 is one of the best studied type I X-ray burster and atoll sources.
Since it covers a wide range in luminosity (from a few to 50 x 10^{36} erg
s^{-1}) and shows clear spectral state transitions, it represents a good
laboratory to test the accretion models proposed for atoll sources. We analysed
the energy spectrum accumulated with BeppoSAX observations (43.5 ksec) in
August 2000 when the source was in a soft spectral state. The continuum of the
wide band energy spectrum is well described by the sum of a blackbody
(kT_{bb}~0.56 keV) and a Comptonized component (seed-photon temperature kT_W~1
keV, electron temperature kT_e~2.7 keV, and optical depth ~11). A hard tail was
detected at energies above ~25 keV. The latter can be modeled by a power law
having a photon index ~2.9 which contributes ~11% of the total flux in the
range 0.1-200 keV. A broad emission line, possibly from a relativistic
accretion disk, models the feature in the Fe K line region of the spectrum.
This is the first time that a high energy tail has been observed during a soft
state of the source.
