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Table 1:

Model parameters.

Parameter
Value

$M_{{\rm BH}}$: black hole mass [$M_{\odot}$]
10a
$R_{{\rm c}}$: corona radius [cm] $5.2 \times 10^{7}$ a,b
$\bf {R_{\rm p}/R_{{\rm c}}}$: ratio of inner disk to corona radius 0.9a
D(1+S): Covering fraction of the corona 0.08a
around thermal disk times the seed  
photon correction factor  
$T_{\rm e}$: electron temperature [K] 109
$T_{\rm i}$: ion temperature [K] 1012
$E_{{\rm c}}$: X-ray spectrum cutoff [keV] 150
$\alpha$: X-ray spectrum power-law index 1.6
$\eta$: acceleration efficiency 10-2
$B_{{\rm c}}$: magnetic field [G] $5.7 \times 10^5$
$n_{\rm i},n{\rm e}$: plasma density [cm-3] $6.2 \times 10^{13}$
$A_{{\rm ph}}$: normalization constant [erg3/5 cm-3] $2.6 \times 10^{12}$
a: hadron-to-lepton energy ratio 1-100
kT: disk characteristic temperature [keV] 0.1
v: advection velocity [c] 0.1

Notes. (a) Typical value for Cygnus X-1 in the low-hard state (Poutanen et al. 1997). (b)  $35~R_{{\rm G}}$, $ R_{{\rm G}}=\frac{GM}{c^{2}}$.


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