Fig. 2
The pair opacity of gamma rays for different energies and different values of the
normalised accretion 
. The individual
curves are labelled by the logarithm of the energy in eV. The different panels
correspond to different normalized mass accretion rates.
a): ṁ = 10-2; b):
ṁ = 10-3; c):
ṁ = 10-4; d)
ṁ = 10-5.
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