import type { DataXY } from 'cheminfo-types';
/**
 * Returns the numberMaxPoints points with the bigger y.
 * @param data - object that contains property x (an ordered increasing array) and y (an array).
 * @param numberMaxPoints - number of points to keep.
 * @returns the points filtered to keep the `numberMaxPoints` most intense points of the input.
 */
export declare function xyGetNMaxY(data: DataXY, numberMaxPoints: number): DataXY;
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