  XMM-Newton Reflection Grating Spectrometer (RGS) spectra of the Narrow Line
Seyfert 1 galaxies MCG -6-30-15 and Mrk 766 are physically and
spectroscopically inconsistent with standard models comprising a power-law
continuum absorbed by either cold or ionized matter. We propose that the
remarkably similar features detected in both objects in the 5 - 35 A band are
H-like oxygen, nitrogen, and carbon emission lines, gravitationally redshifted
and broadened by relativistic effects in the vicinity of a Kerr black hole. We
discuss the implications of our interpretation, and demonstrate that the
derived parameters can be physically self-consistent.
