Spectral Signatures of Winds from Accretion Disks Around Black Holes
  We show that with the wind/jet activity, the spectral index of hard X-ray is changed in galactic microquasars. When mass loss takes place, the spectrum becomes softer and when mass gain takes place, the spectrum becomes harder. We present examples of such changes in GRS1915+105. 
Sandip K. Chakrabarti, A. Nandi and A.R. Rao