The following warning message might be issued and no plot line is drawn when generating regression lines using a regression interpolation with the GPLOT procedure:

WARNING: Regression Line obscured.

This problem is most likely to occur when generating multiple plot lines with a plot request in the form of Y*X=Z in the PLOT statement. The warning is issued and the regression line is not drawn when the value of the Z variable exceeds 32 characters in length.

To circumvent the problem, reduce the length of the Z variable to 32 characters or less.

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