Figure 4: Synthetic data: Interference matrices ${\widehat{\mathbf{\text{W}}}}^{\left[m\right]}{\mathbf{\text{A}}}^{\left[m\right]}$ corresponding to the diagonal ISI values in Figure 3.

Cross-modal subspaces are highlighted in blue while unimodal subspaces are highlighted in green. The same subspace permutation was applied for both modalities for ease of interpretation. The correct subspace structures were identified and aligned across both modalities by three workflows (rows II-VII), in accordance with the ground-truth simulation design (row I), except that the multimodal baseline failed to estimate $S_1$ and $S_4$ (rows VI-VII).