\node[task,inner sep=-4.5pt,below=of C1,fill=white,xshift=6.5em,yshift=-4.5em] (Tn) {Task\textsubscript{n}};
\node[task,inner sep=-4.5pt,below=of C1,fill=white,xshift=5em,yshift=-3.0em] (Td) {\ldots};
\node[task,inner sep=-4.5pt,below=of C1,fill=white,xshift=6.5em,yshift=-4.5em] (Tn) {Task\textsubscript{n}};
\node[task,inner sep=-4.5pt,below=of C1,fill=white,xshift=5em,yshift=-3.0em] (Td) {\ldots};