import type { DataXY } from 'cheminfo-types';
/**
 * Convert a DataXY object to a flat interleaved array [x, y, x, y, ...].
 * @param data - DataXY object with x and y arrays.
 * @returns flat array alternating x and y values.
 */
export declare function xyToInterleaved(data: DataXY): Float64Array;
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