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(33) 
From Eq. (18)

(34) 
and from Eq. (20)

(35) 
thus

(36) 
For the second term, from Eq. (18)

(37) 
and from Eq. (27)

(38) 

(39) 

(40) 
giving finally

(41) 
The typical numbers mentionned above, with
, yield

(42) 
of the order of per K. Note that this could be higher for
higher opacities (hence higher ).
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20180621