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The interaction of K - with protons is characterised by the presence of several coupled channels, systems like K ¯ n and π Σ with a similar mass and the same quantum numbers as the K - p state. The strengths of these couplings to the K - p system are of crucial importance for the understanding of the nature of the Λ (1405) resonance and of the attractive K - p strong interaction. In this article,
