Time-dependent cycle-to-cycle averaged visibilities of the best dynamic model (solid line) superimposed on the [14−16 m], [29−31 m], and [59−62 m] baselines MIDI data (squares) in the 8.5 (left), 11.3 (middle), and 12.5 μm (right) spectral bands. Dotted error bars give the dispersion created by the cycle-to-cycle variation.