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Problems with Waveform Graph

When I add a Waveform Graph into the Front Panel, the Block Diagram Window shows it as DBL instead of the usual indicator for the Graph. How can I solve this problem?
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I don't see what the problem is. The default waveform graph type is an array of doubles and that's what your diagram has. If you create a waveform data type and wire it to the indicator, it will change the graph's icon.
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