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Multi‐epoch  XMM–Newton  spectra of the two narrow‐line Seyfert 1 (NLS1), Mrk 478 and EXO 1346.2+2645, are presented. The data were fitted with different models, including the relativistically blurred reflection model  reflionx , which was found to give a good description of both spectra in all epochs. The two sources are reflection dominated with the illuminating continuum hidden from view. This can be explained in terms of either a corrugated disc or strong gravitational light bending effects. The emission from these two sources comes from a very small region (a few gravitational radii), very close to a rapidly spinning black hole. Spectral variability analysis shows that both sources have constant rms spectra, and constant hardness ratios in all epochs, in agreement with a single spectral component. The constancy spectrum between high and low states rules out alternative models such as partial covering.

Reflection‐dominated X‐ray spectra of narrow‐line Seyfert 1 galaxies: Mrk 478 and EXO 1346.2+2645