Fig. 9.
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Left panel: comparison between periods for slow waves in the LTE case (blue line) and in the non-LTE case (red line) versus temperature. Right panel: theoretical (blue line), following Eq. (45), and numerical (red line) ratios of the periods of slow waves versus temperature, computed for the LTE and non-LTE cases. Also, kx = 10−6 m−1, ρ0 = 4 × 10−11 kg m−3, and χ = 13.6 eV.
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