The unobserved sector of the four maps of Figure 3 (columns), within ±45^∘ latitude, for the three-view target and the estimates of HelioFill, persistence, and climatology (rows), all on one color scale; cyan: edge of S; ρ: correlation with the target over S (HelioFill 0.57, 0.51, 0.54, and 0.60; persistence 0.51, 0.48, 0.40, and 0.48; climatology 0.24, 0.30, 0.52, and 0.55). HelioFill places the active regions that persistence carries from the sector’s last observation, without the seams and streaks of the persistence composite, and adds texture of realistic amplitude; climatology is a smooth latitudinal profile without active regions. The smoother strip 20–32 px outside each edge of S in HelioFill is the unrefined 12 px band of Section 3.9.