Top row: from left to right: coverage of the (u,v) plan, squared visibilities V² and closure phase for the PIONIER observations. Bottom left panel: correlated fluxes for the three MIDI observations and the IRS spectrum. Filled red diamonds (baseline UT1–UT4) have been discarded from the analysis (see text for details). Bottom right panel: NaCo/SAM squared visibilities as a function of spatial frequency.