Blow-up of the region around the He II line for the stacks of the narrow emitters (thick black line) and the broad emitters (light black line). We report the Gaussian with an observed FWHM = 1000 km s-1, the width that we measure for the He II line in the narrow stack. For comparison, we also show other Gaussians with intrinsic FWHMs of 800 km s-1 (green dashed line), 1200 km s-1 (blue dashed line) and 1500 km s-1 (cyan dashed line). These line widths, once convoluted with our 1000 km s-1 resolution, produce observed FWHM of 1250, 1500, and 1800 km s-1, respectively.
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