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Fig. 4.
Histograms of spectral index distribution for the populations of MSPs (P ≤ 30 ms) and normal population (P > 30 ms) from the database PSRCAT v1.62 (Manchester et al. 2005). A normal distribution is fit in each case, resulting in ⟨αMSP⟩= − 1.95 ± 0.54 for the MSP-only population, and ⟨α⟩= − 1.76 ± 0.79 for the rest.
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