Abstract
For pulsars at distances of several kpc, ∫neds may depend primarily on the HII regions in the line of sight. The importance of hydrogen ionized by early type stars can be estimated.
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DAVIDSON, K., TERZIAN, Y. Galactic HII and the Dispersion Measures of the Pulsars. Nature 221, 729–732 (1969). https://doi.org/10.1038/221729b0
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DOI: https://doi.org/10.1038/221729b0
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