One-dimensional spectra for the candidate quadruple AGN system. QSO1 and QSO2 are the two SDSS quasars, while AGNc1 and AGNc2 are the two additional AGN candidates. For each source, we indicate both the data and noise spectrum (see legend). Orange dashed vertical lines indicate the location of important rest-frame UV transitions at the redshift of each object obtained from a fit to the C III]λ1908 line. The location of sky-lines with residuals in the spectrum of AGNc2 are indicated with shaded vertical areas. Due to the vastly different magnitudes of the objects, the y-axis range is different in each panel.