This is our starting situation
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We create new column which concatenates bucket and corner
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We then build X-axis such as way that corner is on lowest level, middle our new column and highest bcket
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Then we double click on x-axis hide our new column
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right click and order by desc
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Depending on your data you might have to modify your order statistic.
Or do you wish to have something else as your final layout?
-Jarmo