Observed flux in the 2−10 keV band of Mrk 1210 (top panel), Fe Kα line equivalent width (middle panel) and column density (bottom panel) as a function of time. The inset panels show the zoomed-in region of the five Chandra observations during 2008. (*) We report here the equivalent width of model 1 instead of that of model 2 in Ohno et al. (2004). The two values are consistent within the uncertainties, and we adopt the more constrained one for clarity.