Three different geometrical models compared with the observed visibilities (V²) and closure phases of PDS 37. The black points with vertical error bars are the observed data, and the blue triangles correspond to a representative best-fit model (a). The best-fit models correspond to (panel a) a binary with a ring surrounding the primary (Red. χ² ∼10), (panel b) a binary with both companions resolved and some asymmetric flux toward its primary (Red. χ² ∼6), and (panel c) a binary model with both companions resolved (Red. χ² = 10).