This research has made use of the Jean-Marie Mariotti Center \texttt{SearchCal} service \footnote{Available at http://www.jmmc.fr/searchcal} co-developped by LAGRANGE and IPAG, and of CDS Astronomical Databases SIMBAD and VIZIER \footnote{Available at http://cdsweb.u-strasbg.fr/}. @ARTICLE{2016A&A...589A.112C, author = {{Chelli}, A. and {Duvert}, G. and {Bourg{\`e}s}, L. and {Mella}, G. and {Lafrasse}, S. and {Bonneau}, D. and {Chesneau}, O.}, title = "{Pseudomagnitudes and differential surface brightness: Application to the apparent diameter of stars}", journal = {\aap}, archivePrefix = "arXiv", eprint = {1604.07700}, primaryClass = "astro-ph.SR", keywords = {stars: fundamental parameters, methods: data analysis, astronomical databases: miscellaneous, catalogs, techniques: interferometric}, year = 2016, month = may, volume = 589, eid = {A112}, pages = {A112}, doi = {10.1051/0004-6361/201527484}, adsurl = {http://adsabs.harvard.edu/abs/2016A%26A...589A.112C}, adsnote = {Provided by the SAO/NASA Astrophysics Data System} }