the single Gaussian is significantly affected by the blue component. The single Gaussian fits for the subsamples indicate that the low-stretch SNe have significantly lower velocities than the high-stretch SNe. However, the double-Gaussian fits show that this is not the case for the photospheric component.

To investigate the importance of the blue component to the measured  from these two methods, we created artificial, but realistic, line profiles. In Figure \[f:gauss\], we again show the median spectrum from the sample. We created a double-Gaussian line profile to mimic the profile of the median spectrum. We then varied the height of the bluer Gaussian, but left all other parameters fixed. We display several example line profiles in Figure \[f:gauss\]. Visually, all of these line profiles appear physically possible and represented in nature. The full sample of line profiles vary from having no blue component to having a blue component that is about twice as strong as the red component.

![Ca H&K line profiles. The black curve is the median spectrum from the full sample. The solid lines are artificial line profiles created from two Gaussians where only the height of the blue component varies. The dotted lines are single-Gaussian fits to the 