Fig. 6

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Optical depth calculated over the atmospheric column for CH4 and C2H2. The transparent green and cyan bands represent the absorption spectral ranges used for the CR calculations. For CH4 the absorption spectral range is considered between 125 nm and 130 nm and for C2H2 between 150 and 153 nm. The transparent magenta band is the non-absorbed (N.A.) spectral range over which hydrocarbon absorption was assumed to be negligible.
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