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Fig. C.1

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The W-term increases for lower elevations of the target field. Using the W-Projection algorithm, the computing time increases with w2. This figure shows the normalized cumulative distribution of the w-coordinate (left panel) for a typical LOFAR observation, and the corresponding normalized cumulative computing time (right panel). We can see that rejecting the  ~5% of the points with w > 104 saves  ~70% of the computing time.

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