Supernovae parametric model fits and residuals for 8 representative SNe IIb. The red points show the o-band photometry from ATLAS for each of the SNe in our sample. The black continuous line represents each SPM fit. Inside each panel, we indicate the name of the corresponding SN. Bottom Panels display the residuals of the SPM fit for each SN. The dashed lines mark the ±3σ_r thresholds, which we use to identify outliers. We excluded these outliers from the SPM refitting process. Cyan squares highlight the outliers, which we define as evidence for EE.