Discrete correlation function for the light curves of RXTE/ASM and MAGIC for the 2.3 yr long period (Period 1, 2 and 3). Time lags from −50 to +50 days in steps of two days are considered. Black dots represent the DCF values with the error bars calculated as in Edelson & Krolik (1988). The green (blue) lines represent the 99% and 1% (95% and 5%) confidence limits for random correlations resulting from the dedicated Monte Carlo analysis described in Sect. 6.
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