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Thanks for your inquiry. Although there is a way to retrieve the array, which is reserved for internal usage.
If you take a look at the IHeatmap2DArrayDataSeries interface, it exposes the GetArray2D() method which returns a copy of the array. You need to cast Heatmap2DArrayDataSeries to IHeatmap2DArrayDataSeries to call it.
Please be aware that it performs a full copy of the initial array. Also you don’t want to make any changes to it, because this may cause unexpected results. If you need to change something, the only option is to recreate the Heatmap2DArrayDataSeries.
Hope this helps!
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