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Table 1.
Four emission lines used as external low-energy target photons.
| i | Wavelength | Relative flux density | Line designation |
|---|---|---|---|
| λ0, i/nm | contribution Kline, i | ||
| 1 | 30.5 | 2.00 | Helium II Lyman-α |
| 2 | 93.0 | 0.17 | Hydrogen Lyman series |
| 3 | 102.6 | 0.57 | Hydrogen Lyman-β |
| 4 | 121.5 | 5.40 | Hydrogen Lyman-α |
Notes. Kline, 3 and Kline, 4 are the relative flux density contributions found by Pian et al. (2005). Kline, 1 and Kline, 2 were adopted from Abolmasov & Poutanen (2017).
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