Characterizing spectral continuity in SDSS u′g′r′i′z′ asteroid photometry P. H. Hasselmann, M. Fulchignoni, J. M. Carvano, D. Lazzaro and M. A. Barucci A&A, 577 (2015) A147 Published online: 20 May 2015 DOI: 10.1051/0004-6361/201424620