Free Access

Fig. 12


Distribution of spectral indices derived by fitting a power-law to mock continua generated using the principal components and the distributions of coefficients cij derived from our SDSS-DR7 subsample (grey histogram) compared to the spectral index distribution obtained from fitting SDSS-DR7 spectra (black histogram).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.