Table 2.

Nominal values and variations of parameters used to determine the PDF model uncertainty. Variations marked with an asterisk are in conflict with the requirement ${\mu }_{\text{F},0}<m_{\mathrm{c}}$ and thus cannot be used directly for the uncertainty estimation. Following Ref. [62], the results obtained for the opposite variation are symmetrized in these cases

Parameter	Nominal value	Variations
		down	up
$Q_{\min }^2$ ($\mathrm{Ge}{\mathrm{V}}^2$)	10	7.5	12.5
$f_{\text{s}}$	0.4	0.3	0.5
$m_{\mathrm{c}}$ ($\mathrm{Ge}\mathrm{V}$ )	1.43	1.37*	1.49
$m_{\mathrm{b}}$ ($\mathrm{Ge}\mathrm{V}$ )	4.5	4.25	4.75
${\mu }_{\text{F},0}^2$ ($\mathrm{Ge}{\mathrm{V}}^2$)	1.9	1.6	2.2*