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Creating Histogram-Data from X,Y,Z-Data


Hi All,
I do have some Data like the following:
{{1, 2, 3}, {4, 5, 6}}
To use a histogram-function (like Histogram3D) I need to transform this 
into a list like:
{{1,2}, {1,2}, {1,2}, {4,5}, {4,5}, {4,5}, {4,5}, {4,5}, {4,5}}
This means "Create an X/Y-Pair for each Z-Value. Possibly with an 
optional Z-Step. Second Example (Z-Step: 2)
{{1, 2, 4}, {4, 5, 6}}
Would result in:
{{1, 2}, {1, 2}, {4,5}, {4,5}, {4,5}}
Did anybody know a simple converting-Function?
Kind regards
Andre



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