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Outliers, per side and exchange (premium_pct and median_premium_pct checked separately): a run of at most 4 consecutive samples spanning at most 90 minutes whose premiums are all more than max(5 percentage points, 6 * 1.4826 * MAD) from both the median of the up to 7 samples before the run and the median of the 7 after it (within 12 hours; MAD = the larger of the two sides' own median absolute deviations), with the samples next to the run inside that band and the two medians agreeing (the series returns to its level), is excluded from the daily avg/min/max/close (premium_pct) or median/top averages (median_premium_pct). Level shifts and the newest samples are never flagged. When more than max(1, 10%) of a UTC day's samples would be flagged, nothing in that day is excluded and runs reaching into it are kept whole. Outliers are judged within each month file, so the first and last samples of a month have context on one side only. Flagged samples stay in the 30-minute files with outlier=true and are counted in the daily outlier_samples column. 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