A plot of the injection region described in Section 3.5. The heatmap shows the relative value (as a fraction of the maximum value) of the product of the radial and angular dependence: f(r)g(θ). The actual weighting for each cell of the injection region is the product of this quantity evaluated at the cell center and the geometric factor determining the overlap of the injection region and the specific cell, and is normalized such that all the weights add to 1. Neither this normalization nor the geometric factor is included in this plot in order to focus on the distribution of the f(r)g(θ) factor. Regions shaded black are outside the injection region and have a weighting of 0.