Thermal electrons in an ultra-relativistic shock shape the optical afterglow of GRB 250702F

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Table B.1.

Spectral parameters for cutoff power-law model fits to prompt emission spectra.

SP	t_start	t_end	F_{10 − 40000 keV}	α_X	E_cut
	[s]	[s]	[erg cm⁻² s⁻¹]		[keV]
1	28.5	38.5	$(3 . 4_{- 0.4}^{+ 0.5}) \times 10^{- 7}$ $Mathematical equation: $ (3.4^{+0.5}_{-0.4}) \times 10^{-7} $$	$- 1 . 14_{- 0.06}^{+ 0.07}$ $Mathematical equation: $ -1.14_{-0.06}^{+0.07} $$	$885_{- 222}^{+ 335}$ $Mathematical equation: $ 885_{-222}^{+335} $$
2	39.7	49.7	$(2 . 6_{- 0.7}^{+ 1.0}) \times 10^{- 7}$ $Mathematical equation: $ (2.6^{+1.0}_{-0.7}) \times 10^{-7} $$	$- 1 . 49_{- 0.07}^{+ 0.07}$ $Mathematical equation: $ -1.49_{-0.07}^{+0.07} $$	> 2000

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