  We study orbital modulation of X-rays from Cyg X-3, using data from Swift,
INTEGRAL and RXTE. Using the wealth of the presently available data and an
improved averaging method, we obtain energy-dependent folded and averaged light
curves with unprecedented accuracy. We find that above ~5 keV, the modulation
depth decreases with the increasing energy, which is consistent with the
modulation being caused by both bound-free absorption and Compton scattering in
the stellar wind of the donor, with minima corresponding to the highest optical
depth, which occurs around the superior conjunction. We find a decrease of the
depth below ~3 keV, which appears to be due to re-emission of the absorbed
continuum by the wind in soft X-ray lines. Based on the shape of the folded
light curves, any X-ray contribution from the jet in Cyg X-3, which emits
gamma-rays detected at energies >0.1 GeV in soft spectral states, is found to
be minor up to ~100 keV. This implies the presence of a rather sharp low-energy
break in the jet MeV-range spectrum. We also calculate phase-resolved RXTE
X-ray spectra, and show the difference between the spectra corresponding to
phases around the superior and inferior conjunctions can indeed be accounted
for by a combined effect of bound-free absorption in an ionized medium and
Compton scattering.
