Fig. 1
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Line force multiplier M(τ) as a function of the characteristic Sobolev optical depth τ. The black-dashed line is plotted by calculating M(τ) at temperature 30 kK and density 10−10 g cm−3, whereas the red line is calculated by fitting M(τ) using MG(τ) in Eq. (13). The best fit for the line force parameters for this particular temperature and density are 
, Q0 = 1418, and α = 0.59.
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