We then used the identified peaks as initial values for fitting the angular response of each region with n Gaussians, where n is the number of local peaks found (Fig. ). The general formula for the Gaussian fit with Ai the amplitude, σi the standard deviation, and μi the mean of each Gaussian, is shown in equation 1. The angle is denoted by θ. Due to the circular domain, we duplicate the Gaussians before and after the 180° range, resulting in an input range of . This extension of the input range is required as some peaks are situated close to the edges of the domains.