T1 & \small{task 1} & \timelinec & \timelinec & \timelinec &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  \\ \hline
T1 & \small{task 2} &  &  &  & \timelinec & \timelinec &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  \\ \hline
T2 & \small{task 3} &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  &  & \timelinec & \timelinec & \timelinec & \timelinec \\
