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We considered an $N_R$-replica system and calculated an overlap function $q_m$ between different replicas having used a cluster heat bath (CHB) Monte Carlo method. We determined transition temperature between $\\langle 2 \\rangle$ phase and a floating incommensurate (IC) phase as $T_{C2}/J = 0.89 \\pm 0.01$ with frustration ratio $\\kappa (\\equiv -J_2/J_1) = 0.6$. 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