Best-fitting synthetic visibility profiles with forsterite+ aluminum of DMA 1 at phase φ_bol = 0.60 and φ_bol = 0.86 (red solid lines) together with the MIDI measurements of the star (black solid lines) for periods 2009 (cycle 1) and 2011 (cycle 3), respectively. Red bars, next to the legend, represent the average phase dispersion of the model. Red dotted lines represent the synthetic visibility profiles with aluminum dust only of DMA 1 at the same bolometric phases.