CIV 1550-region Broad Absorption Line quasar continuum reconstructions:
Non-negative Matrix Factorisation (NMF) reconstructions, as described in Allen et al. (2011 MNRAS 810, 460. arXiv:1007.3991), are available for 48146 quasar spectra. A FITS file is provided for each quasar in DR6 with wavelength coverage allowing the calculation of the CIV Balnicity Index (BI). The original SDSS spectrum and an absorption-free `continuum' reconstruction that covers the CIV emission and absorption regions are provided. See the enclosed README.txt for more information.