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The energy spectra of X-ray binaries (XRBs) have been investigated during thelast few decades with many observatories in different energy bands and withdifferent energy resolutions. However, these studies are carried out inselected states of XRBs like during outbursts, transitions, quiescent states,and are always done in limited time windows of pointed observations. It is nowpossible to investigate the long term averaged spectra of a large number ofX-ray binaries with the all sky monitor MAXI, which also has a broad energyband. Here we present the average spectral behaviour of a few representativeXRBs. The long term averaged spectrum of Cyg X-1 is described by a sum of twopower-laws having $\Gamma_{1}$ ~ 2.8 and $\Gamma_{2}$ ~ 1.2, along with a multicolor disk blackbody having an inner disk temperature of 0.5 keV, GX 301-2 isdescribed by a power-law with a high energy cut-off at $E_{c}$ ~ 15 keV and ablackbody component at 0.2 keV and that of Aql X-1 is described by a multicolor disk blackbody at 2 keV and a power-law of $\Gamma$ ~ 2.2. We have alsoconstructed the combined X-ray spectrum of the X-ray binaries in the Milky Way,which can be compared to the XRBs spectra of other galaxies observed withChandra and XMM-Newton. These measurements are also relevant to investigate theX-ray interaction with the ISM and its contribution to the ionising X-raybackground in the early universe.

Average spectral properties of galactic X-ray binaries with 3 years of MAXI data