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How to save data from a waveform chart to a file?

Hi! I have a question:how to save a real time data from a waveform chart? attachement is a example,how can i do to save the data from 0 second to 25 seconds to a file ?thanks!
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You can use a property node to get the chart history as a array. Then you can write that data to the file. The data in the array in you example can also be writen to a file. If you only wnat a portion of the data to be saved, use the Array Subset function to get the part you want.

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