Splitting a horizontal legend across two lines

I am not sure why this is such a difficult question to find an answer to, I have found similar questions here, but they are not relavent to my issue.

I am plotting a figure with 9 different datasets plotted for comparison. When I create a 'southoutside', 'horizontal' legend, I get a long legend bar on a single line. Instead, what I would like to do is span the legend over two lines, so dataset 1-5 on the upper line, and dataset 6-9 on the lower line. So I can't specify NumColumns; I need to specify the NumRows equivalent, or something akin to this:

legend({'Data 1', 'Data 2', 'Data 3', 'Data 4', 'Data 5'; 'Data 6', 'Data 7', 'Data 8', 'Data 9', ''}, ...
    'Orientation', 'horizontal', 'Location', 'southoutside', 'Position', [Left, Bottom, Width, Height])

Answer 1

[Voss]

plot(magic(9))

legend({'Data 1', 'Data 2', 'Data 3', 'Data 4', 'Data 5', 'Data 6', 'Data 7', 'Data 8', 'Data 9'}, ...
    'Orientation', 'horizontal', 'Location', 'southoutside', 'NumColumns', 5)