Part of a simulated spectrum for the Arcus mission for NGC 3783 with the same source parameters as it showed on 22 August 2016 (this paper). The simulated spectrum is shown as the black histogram with error bars. The red curve shows the obscured continuum that the warm absorber receives, scaled down by a factor of 3.3. The narrow O VIII Lyman alpha emission line at 19.15 Å is from a remote region and is cutoff in this plot. This figure shows that Arcus will be able to separate the narrow absorption lines of the warm absorber from the broad absorption lines from the obscurer.