• The report now includes the fit statistics and coefficient uncertainties. Checks

confirm that windowed fits report errors only for the selected window; constant- data R² and estimates with no residual degrees of freedom are labeled undefined. All 116 targeted tests passed.

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• Your existing fit ... -p command now also prints:

• R²
• Coefficient uncertainties (±1σ)
• RMSE, residual sum of squares, and residual standard error
• Sample count, parameter count, and degrees of freedom
• Fitted coordinate ranges

For windowed fits, statistics cover only the selected window.

Verified: 116 tests passed. Entire-Checkpoint: 01M239G46QPCA4SC036CGZNQFS