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RS Oph has flickering source with (U-B)_0=-0.62 \\pm 0.07, (B-V)_0=0.15 \\pm 0.10, (V-R)_0=0.25 \\pm 0.05. We find for the flickering source a temperature T_fl = 9500 \\pm 500 K, and luminosity L_fl = 50 - 150 L_sun (using a distance of d=1.6kpc). We also find that on a (U-B) vs (B-V) diagram the flickering of the symbiotic stars differs from that of the cataclysmic variables. The possible source of the flickering is discussed. 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