Scatter plots of FWHM vs. offset of the peak from the source velocity (top) and intensity in the 2₀₂ −1₁₁ line corrected to a common distance of 200 pc (bottom) for the Gaussian components for Class 0 (left) and I (right) sources. When scaling the intensities, a linear scaling was used for the cavity shock components while a point-source scaling was used for the spot shock and envelope components. The black arrow indicates the broader of the two shock spots towards NGC 1333-IRAS4A which is discussed further in Appendix B.3.