Temporal averages and scatter analysis for the network areas in data A (left) and data B (right). First row: mean images at Δλ = −0.8 Å. Second row: mean images summing the Hα core over Δλ = [ − 0.4, +0.4] Å. Third row: corresponding scatter diagrams. The poor-seeing moments are discarded, as specified in Fig. 2. The green boxes select pixels with average wing darkening but large core darkening. Online image blinkers: 1–3, 2–4.