[en] Spectra for 3C 273, M87, and NGC 4151 are presented in the 0.5--5 keV band. The bandwidth of our rocket-borne instrumentation permits information to be derived on absorption in the low energy spectra without the need to normalize to a nonsimultaneous hard X-ray result of a different experiment. None of our spectra require strong self-absorption at a statistically significant level. General techniques for error estimation in parameters of X-ray spectra are discussed, and the results are applied to the spectra previously reported for these objects. It is shown that the chi²+1 technique which has been used in these analyses can drastically underestimate the magnitude of these errors. We conclude that the suggested division of extragalactic X-ray sources into two groups characterized by the magnitude of absorption in their spectra is premature