Scatter plots of Relative RMS. Top panel: Scatter plot of the Relative RMS from the variable inner and outer slope fits versus the variable inner slope fits. It is clear that the variable inner and outer slope fits generally have a lower RMS, as expected since the underlying shape is the same and the former has one more degree of freedom. Bottom panel: Scatter plot of the Relative RMS from the variable inner and outer slope fits versus polytropic fits. The colors and symbols are the same as in Fig. 9.