Figure 10. Smoothed spectra of WD absorption cross-section from Victorova and Zhevakin (V&Zh) , Scribano and Leforestier (S&L)  and Lee et al.  for temperatures around 296 K. The MTCKD  continuum model and empirical self-continuum of Burch  are also presented for comparison: (A) mm-wave region and (B) mid-to-far infrared spectral regions. The dashed lines in (B) show ratios (right hand axis) of the S&L and Lee et al. calculated spectra to the experimental continuum  (above 340 cm-1) and to the MTCKD-1.3 model (below 340cm-1). The equilibrium constant used by S&L: Keq,S&L(~296 K)=0.05 atm-1, is adopted here to represent WD absorption cross-section for all three works. This causes the cross-section curve from Lee et al. to be a factor 1.86 lower than in the original work. The absorption in dB/km from V&Zh and S&L is converted to cm2 molec-1 atm-1 units using formula: 2:3026 x 10-6 [dB/km]* T *Keq,S&L/ (273.15* NA* PWD), where NA=2.687x1019 molec cm-3; T~296 K; PWD is WD partial pressure (atm) assumed in the particular work:8x10-6 in V&Zh and 2.2x10-5 in S&L. The implicit term Keq, S&L/Keq (where Keq is equilibrium constant applied for calculation in particular work) is used in the formula above to bring different calculations to similar conditions.
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