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Fig. 1
Left: wave packet signal (WP) measured in a 1024 × 1024 pixel2 area. The gray scale covers ⟨WP⟩± 1.5σ. Right: the 1% of pixels in this area with a sharp WP gradient due to defects of the camera optics (∥ ∇(WP) ∥ ≥ 16σ). Four camera defects a–d of different types are circled in the two figures for discussion in Sect. 2.5.
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