Comparison of the unfolded spectra of Mrk 273 from the 2000 Chandra (open circles), 2002 XMM-Newton (open triangles), and 2006 Suzaku (closed squares) observations. The unfolded spectra were created using the best-fit models to each individual spectrum. The shapes of the spectra appear consistent between 1 and 2 keV. The flux of the Suzaku spectrum is higher than that of the others below 1 keV, while the Chandra spectrum appears to be higher than the others between 4 and 6 keV. These differences are correlated with the flux variability as shown in Figure 8. This comparison also shows that the iron line at 6.4 keV is detected in all three observations. While the 2–10 keV flux variability is not very significant, the spectral shape of the source has changed between 2000 and 2006. This change may be due to the variations in the column density.