Appendix A: Atlas of spectra

All of the spectra are presented in this appendix. In each plot the data points are shown as crosses, with the fits as solid lines and the fitted continua as broken lines. The spectra are arranged in the same order as in Table 1. The error bars shown are the statistical errors on the data points and do not include the absolute flux calibration errors discussed in Sect. 3.2. Please also note that the fits shown are the "complete'' fits, covering the complete wavelength range: in some cases (as indicated in Table 2 and discussed in Sect. 2.5) the narrower features were fitted independently and these fits are not shown here.