Table 1.

Impact on cross sections, in percent, for each systematic uncertainty source in the four photon rapidity regions, $|y^{\gamma }|<0.8$, $0.8<|y^{\gamma }|<1.44$, $1.57<|y^{\gamma }|<2.1$, and $2.1<|y^{\gamma }|<2.5$. The ranges, when quoted, indicate the variation over photon $E_{\mathrm{T}}$ between 190 and 1000$\text{GeV}$

Source	$|y^{\gamma }|<0.8$	$0.8<|y^{\gamma }|<1.44$	$1.57<|y^{\gamma }|<2.1$	$2.1<|y^{\gamma }|<2.5$
Trigger efficiency	0.7–8.5	0.2–13.4	0.6–20.5	0.3–7.8
Selection efficiency	0.1–1.3	0.1–1.3	0.1–5.3	0.1–1.1
Data-to-MC scale factor	3.7	3.7	7.1	7.1
Template shape	0.6–5.0	0.1–10.2	0.5–4.9	0.6–16.2
Event migration	3.8–5.5	1.2–4.1	2.0–8.5	2.3–10.3
Total w/o luminosity	5.4–12.0	5.9–18.2	8.2–26.9	8.6–21.7
Integrated luminosity	2.3