We located the zigzags in tissue over the entire brain tissue except in areas which are known to be prone to motion like the periventricular area \unskip~\cite{225062:5067666} as shown in Figure~\ref{187392}.  Regions like skull, ventricle etc and in the attached test tubes showed no zigzags. Otherwise, we found that the zigzag, including the sudden end, could be restored while being averaged over the whole imaging slice Figure~\ref{499388}A.
