Fig. 4.
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Line formation of Hα line at t = 30 s of single thread with Fpeak = 1 (left) and Fpeak = 10 (right). Lighter shades in the background denote larger values of the contribution function. The optical depth unity (red line) and the vertical velocity (blue line) as a function of height are overplotted, and the line profile is shown with a green line (right axis).
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