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Fig. 5


JHKL light curves showing the cycle-to-cycle differences of the two cycles between 1998.0 and 2009.0. The light curves were not corrected for the linear brightening trend. The vertical lines indicate the mid-decline in the light curve during the 1998 periastron passage (left panels, typical error bars are displayed in the lower right corner) and apastron (right panels).

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