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The actual data is presented as the column width stored in the column C("w").
To set the column width from a dataset, set the dataset to Width field in Spacing tab in Plot Details. You also need to set the Scaling Factor to 0, which is the new 9.1 feature (ORG-6010) to indicate the width data or symbol size data from worksheet is in the same unit as the X axis.
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The graph will turn into the following:
