Top panel: Chandra CDF-S and E-CDF-S spectra of PID352, normalized by the effective area and fitted with an absorbed powerlaw, plus one emission line and one absorption line. The red datapoints refer to the E-CDF-S data, and the black ones to the higher statistics CDF-S data. The best-fitting model is shown as continuous curves. The observed-frame energy of the emission and absorption lines are also shown. All of the data have been rebinned to the 3σ level for presentation purposes. Bottom panel: data − model residuals once both datasets are fitted with an absorbed powerlaw without including any feature.