Barely Significant

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time series; If \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\uptheta$$\end{document} < 0, it implies a decreasing trend with time series, and the spatial change trend of RSEI in the BTHSH region can be analyzed accordingly.