The average SED of the 761 type 1 AGN in the S11 sample. The median is shown by the green line, the 32nd and 68th percentiles are shown in blue, the 5th and 95th percentiles are shown in red and the mean value is shown in black, where the thickness of the line corresponds to the error on the mean at each frequency point. The large portions of the SED between radio and W4 and the FUV and very soft X-ray are omitted where they consist purely of interpolation points. The ends of the SED are trimmed when the number of sources included falls to <77 (10 per cent of the initial sample size). The number of sources included in the average SED determination at each frequency is shown in the top subpanel.