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The small diphoton branching ratio is enhanced when the $\\mathcal{CP}$-violating phase, $\\xi$, of the top-Higgs interaction is non-zero. When the modulus of the top-Higgs interaction assumes the SM value, $y_t=y_t^{SM}$, we find that the signal significance reaches $2.7\\sigma$ $( 7.7\\sigma)$ when $\\xi= 0.25\\pi$ $(0.5\\pi) $. 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