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The oscillator strengths of the principal series doublets of Cs f3:2(62S1, 2-rz2P3, 2, 15 < n < 27) and f,i2(62Sl,2-nzPl~2, 15 < M < 21) have been measured in absorption using a high-resolution spectrometer. The oscillator strength ratio of the fine-structure components p = f,,2/fl;2 was found to increase monotonically with the principal quantum number n. From an extrapolation of the relevant Fano function a maximum in the ratio p should not be expected for higher n.

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