import type { DoubleArray } from 'cheminfo-types';
import type { DataReIm } from '../types/index.ts';
/**
 * Calculates reimAbsolute value of a complex spectrum.
 * @param data - complex spectrum
 * @param options
 * @param options.output
 * @returns - reimAbsolute value
 */
export declare function reimAbsolute(data: DataReIm, options?: {
    output?: DoubleArray;
}): DoubleArray;
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