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Count rate spatial dependence. Moving the ion along the trap axis away from the SNSPD reduces the count rate (blue circles) more strongly than is expected based on detector solid angle and ion dipole radiation pattern alone (red line). Including the calculated angular dependence of SNSPD SDE improves agreement (green line). The 68% confidence intervals on the count rates are smaller than the symbols; those on the theoretical calculations are narrower than the plotted lines.
