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Fig. 3.

image

Effect of gridding accuracy for several gridding parameters: (a) kernel oversampling (Sect. 5.1.1), (b) kernel size (Sect. 5.1.2), (c) the number of w-discretisation levels (Sect. 5.1.3), (d) gridding kernel function and IDG comparison (Sects. 5.1.4 and 5.1.5), and (e) padding (Sect. 5.1.6). The plots describe the absolute error of spherically averaged power spectrum measurements using a foreground-avoidance strategy. The direct FT results are used as ground truth. Each plot shows the dependency on one parameter, and the other parameters are kept at their highest accuracy setting (see Table 1).

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