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data : [0]; const min = Math.min(...series); const max = Math.max(...series); const range = max - min; const norm = series.map((v) => (range === 0 ? 0.5 : (v - min) / range)); const [hoverIdx, setHoverIdx] = useState(null); const [focusIdx, setFocusIdx] = useState(null); const activeIdx = hoverIdx ?? focusIdx; const colRefs = useRef<(HTMLDivElement | null)[]>([]); const containerRef = useRef(null); // the readout is centered on the active column's own measured position, // not a parallel `ch`-based pitch calculation: the readout row and the // bar row can differ in font-size (e.g. text-xs vs the ambient size), // which makes `ch` resolve to different px in each row and drift // linearly with column index. 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