《Table 2 Evaluation of all the sampling points in optimal spectral window based on statistics》

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《基于DOAS及统计量的低浓度SO_2测量方法（英文）》

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*There are 137sampling points in optimal wavelength range 294~308nm，Table 2just takes many sampling points for example.**The optimal point set has 36optimal sampling points used for deducing optimal differential absorption cross section.

According to Section 2.2and Table 1，transmitted intensity Im（λi）was obtained at concentration cm.Thus differential absorption cross section was acquired（Fig.3），where different volatility is presented in different wavelength ranges.By means of preliminary concentration retrieval and theoretical inference[10，17]，combined with amplitude and volatility as well，the spectral window 285~318nm was selected for following analysis（Fig.4）.Obviously，compared with Fig.3（c），Fig.4（a）performs superior consistency.In accordance with average value and standard deviation in Fig.4（b），spectral window 285~294nm was abnegated because of its larger volatility，while spectral window 308~318nm was also abandoned owing to its lower magnitude.Optimal spectral window 294~308nm，where there are 137sampling points via the spectrometer，was acquired finally.