The relative spectral changes for band peak position (upper panel, cm^-1) and bandwidth (FWHM) (middle panel, in %) are shown. The lowest panel gives the intensity changes of the emission bands by comparing the values at 14′′ and 7′′. The indicated uncertainties are 1σ-errors. The open squares include the band complex between 5800 and 5900 Å, the band at 6378 Å and the emission band at  ~6615 Å, that all have been reported previously (Schmidt & Witt 1991; Scarrott et al. 1992; Sarre et al. 1995; Van Winckel et al. 2002; Sharp et al. 2006).