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We present a study of the two main peaks of the so-called cathedral QPO inXTE J1859+226. While looking at the temporal evolution of the two features weshow that they do not manifest the same amplitude of variations of their power,and do not seem to follow the flux variations in the same way. We then presenttheir RMS-spectra and show that they do not have the same shape, slope andcut-off energy. We discuss these different facts and try to answer the questionregarding the genuineness of their harmonic relationship.

Are the two peaks of the Cathedral QPO real harmonics?