Table 1.

Summary of the $e^{+}{e}^{-}\to {\pi }^0\gamma$ data sets. For [87] only data points for $\sqrt{s}<1.4\text{GeV}$ are included, as the cross section in the region $(1.4\text{--}2.0)\text{GeV}$ was found to be consistent with zero. In the last column we indicate the size of the systematic errors that we interpret as a normalization-type uncertainty and therefore assume to be $100\%$ correlated

Experiment	Region of $\sqrt{s}$ (GeV)	# Data points	Normalization uncertainty
SND 2000 [84]	[0.99, 1.03]	12	$3.3\%$
SND 2003 [85]	[0.60, 0.97]	30	All systematics
SND 2016 [86]	[0.63, 1.35]	60	All systematics
SND 2018 [87]	[1.08, 1.35]	5	All systematics
CMD-2 2005 [11]	[0.60, 1.31]	46	$6.0\%$