  We examined the profiles and polarization properties of emission lines
originating from the extremely relativistic region of Kepler disks.
  Because the emission region is more localized to the inner part, e.g., a few
times the black hole radius, the profiles, and polarization properties are
remarkably modified. The black hole spin significantly affects the properties
through the inner edge. This observation, in spite of the technical
difficulties, provides an important diagnostic of the relativistic region.
