Abstract
USING the Parkes radiotelescope, we have searched the Southern Milky Way for the 126α hydrogen recombination line of rest frequency 3248.713 Mc/s. (The notation nα indicates a transition from the level of quantum number (n + 1) to level n; nβ indicates a transition from (n + 2) to n.) Nineteen sources were inspected and the line was detected in fifteen, all of which were well known HII regions. The nebulae1 were 
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References
RCW numbers refer to the catalogue by Rodgers, Campbell and Whiteoak, Mon. Not. Roy. Astro. Soc., 120, 1 (1960). W refers to Westerhout, Bull. Astro. Inst., Netherlands, 14, 215 (1958). Numbers such as 1608–51 are co-ordinate numbers of sources in the Parkes Catalogue, Austral. J. Phys., 17, 340 (1964).
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MCGEE, R., GARDNER, F. Hydrogen Recombination Lines 126α and 166α observed in Galactic HII Regions. Nature 213, 579 (1967). https://doi.org/10.1038/213579a0
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DOI: https://doi.org/10.1038/213579a0
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