XRISM/Xtend spectrum of NGC 3783 in the region of the broad Fe XXVI absorption feature of Comp. X. The Xtend data points are shown in black. Our best-fit model to the Resolve spectrum (Fig. 1 and Table 1) is shown in gray. The same model, convolved with the Xtend instrumental response, is overlaid in red. There is close agreement between this convolved model and the Xtend data, demonstrating that our Comp. X from Resolve is consistent with the Xtend data. The dashed blue line represents the continuum plus the broad Fe K emission (Sect. 3.1), under which the broad Fe XXVI absorption is evident in the Xtend spectrum and is likewise seen in the Resolve spectrum (Fig. 1).