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   61066
   We propose to observe the off-plane regions of the Scutum Arm (l = 28)
   at the latitudes of b = 3--4 deg. From the past observations with ASCA,
   we detected another diffuse faint non-thermal-like component in
   addition to the well-known GRXE thermal component of temperature kT =
   3--10 keV. This powerlaw-like component extends toward higher latitudes
   than the thermal component. GINGA also detected a similar "hard tail"
   component in the Galactic ridge X-ray spectra. Therefore, it is highly
   possible that the power-like component is identical with the "hard
   tail" and thus truly of non-thermal origin. In order to further discuss
   the origin of the power-like component, we need off-plane observations
   at higher latitudes.
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