import type { Info2D } from '@zakodium/nmr-types';
import type { NmrData2DFt } from 'cheminfo-types';
import type { UsedColors } from '../../../types/UsedColors.js';
/**
 * calculate the missing projection
 */
export declare function getProjection(datum: NmrData2DFt['rr'], index: number): {
    x: Float64Array<ArrayBuffer>;
    re: Float64Array<ArrayBuffer>;
};
export declare function getMissingProjection(datum: NmrData2DFt['rr'], nucleus: string, datumInfo: Info2D, usedColors: UsedColors): import("@zakodium/nmrium-core").Spectrum1D;
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