J − H versus H − K color−color diagram. Filled squares are observations outside periastron passages (step 1: phases 0.05–0.98, step 3: phases 1.05–1.98). Open squares are observations during periastron (step 2: phases 0.98–1.05, i.e., 2003.5 periastron). The solid curve highlights the quasi-cyclical cycloidal pattern.
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