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Published online by Cambridge University Press: 04 August 2017
The distribution of total spectral indices between 38 and 408 MHz with a resolution of for δ>-25° has the following main properties:
1. Relatively small variations of spectral indices over the sky.
2. High indices in the central region at high galactic latitudes.
3. Moderately low spectral indices in the anticentre region.
4. Lower indices in the low-brightness regions (cold holes).
5. The lowest indices in regions containing large amounts of HII.