Contour plots of the helioseismic phase overlaid on SO/PHI unsigned magnetograms (gray scale saturated at 50 G) for far-side active regions 1 to 6 (see labels in top-left corners). The black dashed contours correspond to |B_los| = 20 G after Gaussian smoothing. The blue, green, and purple contours correspond to Φ = −2σ_Φ, −3.5σ_Φ, and −5σ_Φ, respectively. The red curves mark the boundaries between the far and Earth sides. Active region 3 is not detected by helioseismology.