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   51077
   We propose to observe the off-plane regions of the Scutum Arm (l = 28)
   at the latitudes of b = 2--3. From the past observations with ASCA, we
   have a feeling that there exists another diffuse faint powerlaw-like
   component in addition to the well-known GRXE thermal component of
   temperature kT = 3--10 keV. This powerlaw-like component has a trend to
   extend 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 the identical with the "hard tail" and thus 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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