  This paper reports detailed K-shell line profiles of iron (Fe) and nickel
(Ni) of the Galactic Center X-ray Emission (GCXE), Galactic Bulge X-ray
Emission (GBXE), Galactic Ridge X-ray Emission (GRXE), magnetic Cataclysmic
Variables (mCVs), non-magnetic Cataclysmic Variables (non-mCVs), and coronally
Active Binaries (ABs). For the study of the origin of the GCXE, GBXE, and GRXE,
the spectral analysis is focused on equivalent widths of the Fe K$\alpha$, Fe
He$\alpha$, and Fe Ly$\alpha$ lines. The global spectrum of the GBXE is
reproduced by a combination of the mCVs, non-mCVs, and ABs spectra. On the
other hand, the GRXE spectrum shows significant data excesses at the Fe
K$\alpha$ and Fe He$\alpha$ line energies. This means that additional
components other than mCVs, non-mCVs, and ABs are required, which have
symbiotic phenomena of cold gas and very high-temperature plasma. The GCXE
spectrum shows larger excesses than those found in the GRXE spectrum at all the
K-shell lines of iron and nickel. Among them the largest ones are the Fe
K$\alpha$, Fe He$\alpha$, Fe Ly$\alpha$, and Fe Ly$\beta$ lines. Together with
the fact that the scale heights of the Fe K$\alpha$, Fe He$\alpha$, and Fe
Ly$\alpha$ lines are similar to that of the central molecular zone (CMZ), the
excess components would be related to high-energy activity in the extreme
envelopment of the CMZ.
