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Jiufei Luo 1 ID , Haitao Xu 1, Kai Zheng 1 ID , Xinyi Li 2 and Song Feng 1,* 1 Department of Mechanical Engineering, School of Advanced Manufacturing Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China; jiufluo@gmail.com (J.L.); xuhaitao@zoho.com.cn (H.X.); zhengkai2001@163.com (K.Z.) 2 College of Mechanical Engineering, Chongqing University, Chongqing 400044, China; lixinyi1981@gmail.com * Correspondence: fengsong@cqupt.edu.cn

Barycenter Theorem in Phase Characteristics of Symmetric and Asymmetric Windows