When comparing a ring chart with a pie chart, the ring
chart has no advantage, instead the sections and its
proportions are harder to see. To have some benefit
from a ring chart, it would be usefull to put some
text within the ring. In a ring chart this would be
easier to read than on a pie chart and it would save
place as such text doesn't need to be as the chart
title. Of course the text should be layouted (line
breaks...) to break at the right places to not overlap
the ring, if possible.
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