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(ORG-7459)
Origin9.1 add a Use Existing Dataset interface to the
Origin 9.1 supports choosing an existing dataset as the X dataset of the fitted curve, which enable user to create fitted curve in ranges with different sampling interval or in any non-evenly-spaced data range.
Following curve fitting tools support this option:
- Linear Fit
- Linear Fit with X Error
- Polynomial Fit
- Nonlinear Curve Fit
The option is available in the the Fitted Curves Plot tab/branch, X Data Type drop down list so that user . User can specify an existing column for the X value of Fitted Curve. 
