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Fig. 7.

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uv-domain based flagging on solar visibilites. Panels a and b show solar images at the same frequency and time, before and after SIMPL’s uv-based flagging, respectively. These are at 111.13 MHz with 1 s time integration and 195.3 kHz frequency averaging, and are severely affected by RFI. For panels a and b, white contours are drawn at 5%, 10%, 20%, 30%, 50%, 70%, and 90% of the peak intensity and the dashed yellow contour represents the −5% of the peak intensity. The restoring beam is show in red in the bottom-left corners. Image a exhibits an rms of 13.7 Jy/beam and a dynamic range of 37, while the image b, obtained after outlier flagging followed by another round of self-calibration, shows an improved rms of 7.5 Jy/beam and a dynamic range of 74. Panel c illustrates the corresponding visibility amplitudes as a function of uv-distance. Flagged visibilities (red) were identified as outliers as detailed in Section 5.5. This approach enables effective suppression of corrupted visibilities while preserving genuine solar structure across spatial scales.

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