  The torsional oscillation is a well established observational fact and there
are theoretical attempts for its description but no final solution has yet been
accepted. One of the possible candidates for its cause is the presence of
sunspots modifying the streaming conditions. The present work focuses on the
temporally varying latitudinal distribution of several sunspot features, such
as the spot sizes and spot numbers. These features are different faces of the
butterfly diagram. In fact some weak spatial correlations can be recognized.
