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Rev. C \\textbf{86}, 054611 (2012) and Ma \\textit{et al.}, \\textit{ibid.}, Phys. Rev. C \\textbf{88}, 014609 (2013)]. \\item[Purpose] An improved thermometer ($T_{IB}$) is proposed based on the difference between IYRs. $T_{IB}$ obtained from isobars in different reactions will be compared. \\item[Methods] The yields of three isobars are employed in $T_{IB}$. 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