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Use this function to build the content of the plot frame. These texts This content (text, variable, expression or image) are defined in the frameLayout frameOptions (see Create a Plot Frame), which plotLayout plotOptions includes (see Create a Plot Layout).
This function is also called from streamPlotCreate, but without preview option.
Remarks
- For plots without a frame, this function is not needed.
- With parameter 'preview' the user can preview and, if necessary, correct the texts.
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