Table 3: Values found for the slopes s (see Sect. 5.4) and sv (see Sect. 5.5). "Method'' is the method considered for the calculations of ${\cal P}$ .
Method $\chi _{ k}$ s sv

direct -- 3.4 --

semi-analytical Gaussian 3.1 1.0

semi-analytical exponential 3.0 0.9

semi-analytical Lorentzian 2.6 0.7

**Table 3:** Values found for the slopes s (see Sect. 5.4) and sv (see Sect. 5.5). "Method'' is the method considered for the calculations of ${\cal P}$ .
Method	$\chi _{ k}$	s	sv
direct	--	3.4	--
semi-analytical	Gaussian	3.1	1.0
semi-analytical	exponential	3.0	0.9
semi-analytical	Lorentzian	2.6	0.7

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