Square-root intensity maps of the reconstructed images of π¹ Gru. From left to right and top to bottom, the panels show the pseudo-continuum (4.033 μm), the SiO absorption bands SiO^a (4.043 μm) and SiO^c (4.084 μm), the combined SiO+H₂O feature (8.4 μm), and the dust-emission features Dust₁ (9.8 μm) and Dust₂ (11.0 μm). The blue circle marks the H-band photospheric angular diameter of π¹ Gru A (Paladini et al. 2017) and serves as a reference angular diameter for comparison with the larger sizes observed in the L and N bands. The white curve traces the orbit of the close companion π¹ Gru C (Esseldeurs et al. 2025), with the blue dot and associated bars indicating its expected position and uncertainties at the MATISSE epoch. The white arrow shows the counterclockwise orbital motion. The dashed curves indicate the projected Roche lobes of the two stars. The 1 au scale is derived using the 180 ± 10 pc distance from Esseldeurs et al. (2025). The filled ellipse in the bottom left corner shows the resolution element.