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J.C. Lee, N.S. Schulz (MIT), C.S. Reynolds (JILA - U. of Colorado), A.C. Fabian (IoA - Cambridge), E.G. Blackman (Physics & Astronomy - Univ. Rochester)
A Chandra AO1 30ks HETGS observation of the X-ray transient microquasar GRS~1915+105 reveal absorption edges and faint line emission over the HETG energy range. We find from a preliminary analysis evidence for prominent edges at ~1.74Å(7.13~keV), 6.74Å(1.83~keV) and 5.04Å(2.46 keV) corresponding to neutral iron, silicon and sulphur. The depth of the Si edge is too strong for that expected from the Galactic absorbing column; it may be consistent with the high inclination of the disk. Features corresponding to Fe~XXV, Fe~XXVI with tentative evidence for ~ 500-1000~km~\rm s-1 blueshifts, and neutral iron are also identified.