Example spectrum of ID 00439 (z = 0.6027), which is best fit fit a warm absorber model. The spectrum is shown along with the background model (black dashed line), the absorbed power law model (grey), a partial covering absorption model (orange), and the best-fit warm absorber model (blue). The bottom three panels show the residuals for the power law, warm absorber and partial covering models, respectively. Data have been re-binned for display purposes.