Fig. 2
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Sky maps showing the (S/N-based) PSF of the PTA as a function of sky position. The white stars indicate the positions of the pulsars in the respective PTA. Both plots were calculated using the classic spherical harmonics expansion scheme based on the number of pulsars. Top: 40 pulsar PTA, ℓmax = 5, sreg = 35. Bottom: 20 pulsar subset PTA, ℓmax = 3, sreg = 15.
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