Strong permitted and forbidden emission lines in the spectrum of Wd1-9. Note that the Hα (top left) has a different velocity scale to the remaining lines. In panels where multiple spectra are overplotted, solid line =6/4/2011, dashed line =14/4/2011 and dotted line =25/4/2011 respectively. For N iλ8712, Mg iiλ7896, Fe iiλ6456 and [Fe ii] λ7155 a scaled Fe iiλ9997 line is overplotted for comparison, and in all panels the vertical line marks the radial velocity derived from the Pa9...16 lines. Arrows mark telluric features overlapping the [S iii] line.