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values for a range of periods P1 and P2 and optimised models. Every black cross denotes a local minimum (i.e. not a simple χ2 map). All datasets (DESCAMPS, SPHERE2017, SPHERE2018) were used together, and consequently the spacing between local minima is very fine. The global minimum is denoted by a red circle. The dashed line indicates the exact 3:2 period ratio.

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