The following does not yield squared arrow lines. The lines connecting the two lower blocks are crooked. Does anyone have any idea how to fix that?

Thanks, Dave

\xymatrix {
    &   *+++++[F]{G}    \ar@<-9pt>[ll]
    &   {\scriptsize\begin{array}{ll}w\\~\\~\end{array}}            
    &   *+++++[F]{K}    \ar@<+9pt>@{->}`l/0pt[ld]`[d]_{x}[d]
    &   *++[F]{Q}

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