Five spectra of (50000) Quaoar (solid lines) with their corresponding spectral models (dotted lines) calculated for the spectral region shown and giving most weight to the H-band. Spectra labelled Q1 through Q4 are newly obtained (observing circumstances are reported in Table 1), while Q2008 is the spectrum analysed in Dalle Ore et al. (2009). The spectra are represented in albedo using the value reported by Fornasier et al. (2013) with the correction as described in Sect. 3. The top four spectra have been shifted by +0.2, +0.4, +0.6, and +0.8 units for clarity.