Fig. 18

Shows the relative difference, normalized to the initial smoothed gain without binning, between the red curve of Fig. 15c, representing the binning of both the beam correlation and the detector PSF, and the orange curve, representing only the detector PSF. The relative difference shows the impact of the beam correlation on the smoothing factor under binning. Considering that diagonal binning with a factor of 2 corresponds to halving the width of the beam disc, one can see that adjusting the beam disc has a slight but measurable impact on the smoothed gain \(\beta ^{*}\cdot g\). The relative difference super-linearly increases for higher binning values, which represent further contraction of the beam disc. While being rather negligible for small adjustments in the beam disc, this effect potentially plays a role for EELS measurements in STEM mode, where the beam appears as a small disc on the entrance aperture of the energy-filter.