Intensity profiles and intensity maps for snapshots 122 ( t = 19.18 yr) and 131 ( t = 20.61 yr) of the AGB model st28gm05n057. Left panels : intensity profiles plotted for all wavelengths in the GRAVITY spectral range. Three representative wavelengths are highlighted. Right panels: intensity maps for two selected representative wavelengths, 2.250 μm (continuum) and 2.384 μm (band head of ¹²C¹⁶O, 5-3). A linear scale was used for the intensity. The full movie is available in electronic format at the following link: https://www.aanda.org.