将负数的小数点对齐

Question

我尝试将表格中的数字与小数点对齐。到目前为止，这种方法也有效。但是，对于负数，对齐不再有效。数字向左移动得太远了。不幸的是，我找不到错误所在。

有人能帮我吗？

提前谢谢了！

\begin{table}[ht]
\sisetup{table-format=2.1, table-space-text-post={***}} 
\setcellgapes{2pt}
\makegapedcells 
\setlength\tabcolsep{3pt} 
\begin{tabularx}{\linewidth}{>{$}r<{$}@{\,}>{$}l<{$} | S | *{4}{S} @{}}
\Xhline{1.2pt}
\mcc{2}[c|]{\makecell[t]{CAAR\\Window}} 
    & \mcc{1}[c|]{\makecell[t]{All\\transaction\\forms}} 
        & \mcc{1}{\makecell[t]{Acquisition Of\\ Partial Interest}} 
            & \mcc{1}{\makecell[t]{Acquisition Of\\ Majority Assets}} 
                &  \mcc{1}{\makecell[t]{Acquisition Of \\ Remaining Interest}} 
                    & \mcc{1}{\makecell[t]{Merger}}\\
\Xhline{0.8pt}
(-15,   & -2)   &  1.7*** & 1.3**  &  1.8**  &  2.2*** &  2.0***    \\
(-10,   & -1)   &  1.9*** & 0.9**  &  2.2*** &  2.4*** &  2.5***    \\
 (-5,   & -1)   &  1.3*** & 0.9*** &  1.2*** &  1.4*** &  1.7***    \\
 (-5,   & +5)   & 13.3*** & 5.7*** & 12.2*** & 14.7*** & 20.9***    \\
 (-2,   & +2)   & 12.6*** & 5.5*** & 11.1*** & 13.8*** & 19.9***    \\
 (-1,   & +1)   & 11.8*** & 5.0*** &  9.8*** & 11.9*** & 19.4***    \\
  (0,   & 0)    &  8.7*** & 3.0*** &  6.3*** &  7.0*** & 16.0***    \\
  (0,   & +10)  & 12.1*** & 4.9*** & 10.7*** & 13.5*** & 19.4***    \\
  (1,   & +10)  &  3.4*** & 1.8*** &  4.4*** &  6.5*** &  3.5***    \\
  (2,   & +15)  &  1.2*** & -0.4   &  1.6**  &  2.1*** & -1.4***    \\
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