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Fig. D.1.

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(a) Slit is placed along loop L1 and the corresponding space-time plot is displayed in (b). (c) & (d) is same as (a) & (b), but for loop L2. The cross symbols in (c) marks the location of four small sub-regions of 3 × 3 pixels, over which the normalized intensity variations are displayed in Fig. E.1.

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