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This paper presents a new algorithm, TRIMOR, to analyse multi-order spectraof triple systems. The algorithm is an extension of TRICOR, thethree-dimensional correlation technique that derives the radial velocities oftriple stellar systems from single-order spectra. The combined correlationderived from many orders enables the detection and the measurement of radialvelocities of faint tertiary companions. The paper applied TRIMOR to thealready available spectra of HD188753, a well known triple system, yielding theradial velocities of the faintest star in the system. This rendered the closepair of the triple system a double-lined spectroscopic binary, which led to aprecise mass-ratio and an estimate of its inclination. The close-pairinclination is very close to the inclination of the wide orbit, consistent withthe assertion that this triple system has a close to coplanar configuration.

TRIMOR - three-dimensional correlation technique to analyze multi-order spectra of triple stellar systems; Application to HD188753