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An analysis was made of 0.3-15 keV X-ray spectra of a Narrow-Line Seyfert 1Galaxy, Ton S180, using archival data from ASCA, RXTE, and XMM-Newton. Atenergies above 2.5 keV, a power-law with a photon index of ~ 2.3 successfullyand consistently reproduced the spectra from all of these observatories.Assuming this power-law component to extend toward lower energies, a softexcess, which is one of the most remarkable features of Narrow-Line Seyfert 1Galaxies, is explained by another power-law multiplied by a thermal cutoff at ~0.4 keV. Some similarities have been observed between this object and Galacticblack hole binaries in very high state, the latter being realized under highaccretion rates. Attempts have been made to interpret the soft excess in termsof Comptonization of the disk photons by an electron cloud surrounding theaccretion disk, like BHBs in a very high state.Comment: 7 pages, 7 figure

X-Ray Spectra of the Narrow-Line Seyfert 1 Galaxy Ton S180 in Comparison with Galactic Black Holes