Longtable环境下如何对齐图形和表格的位置

Question

我有以下代码

 \begin{landscape}
    \fontsize{10}{10}\selectfont
    \newgeometry{total={7in,7in}, bottom=7cm}
    \begin{longtable}[htbp]{l*{6}{l}}
    \caption{\large{Regression model conditional on the position of investors}}}\\ \multicolumn{7}{@{}p{0.9\linewidth}@{}}{This table reports the regression result for fixed-effect regression conditional on the \sym{*}\sym{*}\sym{*},\sym{*}\sym{*},\sym{*} indicates the coefficients are statistically significant at 99\%, 95\% and 90\% respectively.\addlinespace}\\
    \toprule
    &\multicolumn{1}{l}{NPV}&\multicolumn{1}{l}{NPV}&\multicolumn{1}{l}{NPV}&\multicolumn{1}{l}{NPV}&\multicolumn{1}{l}{NPV}&\multicolumn{1}{l}{NPV}\\
     &\multicolumn{1}{l}{(1)}&\multicolumn{1}{l}{(2)}&\multicolumn{1}{l}{(3)}&\multicolumn{1}{l}{(4)}&\multicolumn{1}{l}{(5)}&\multicolumn{1}{l}{(6)}\\
    \midrule
    \endfirsthead
    \caption{\textbf{\large{Regression model conditional on the position of investors}- Continued}}\\
    \toprule
    \midrule
     \endhead

        \multicolumn{7}{r}{\footnotesize\itshape       
                            Continue on the next page}
    \endfoot
        \bottomrule
    \endlastfoot
   &&&&&&\\
    \end{longtable}
    \end{landscape}

但是，因为我使用的是命令，

\multicolumn{7}{@{}p{0.9\linewidth}@{}}

表格标题与表格和标题不对齐，这个问题困扰了我很长时间，我真的希望你们能帮我解决。例如，我想要的是 但我所拥有的是

提前致谢