\begin{Schunk}
\begin{Sinput}
 colMstacked <- do.call(rbind, colMresults)
 dim(colMstacked)
\end{Sinput}
\begin{Soutput}
[1] 150   3
\end{Soutput}
\begin{Sinput}
 head(colMstacked)
\end{Sinput}
\begin{Soutput}
     ds           x1           x2
[1,]  1  0.004130791 -0.085854129
[2,]  2  0.028416492  0.062922646
[3,]  3 -0.033087563 -0.041779156
[4,]  4  0.110083615 -0.178247853
[5,]  5 -0.080966386 -0.001748287
[6,]  6 -0.019188038 -0.169436776
\end{Soutput}
\end{Schunk}
