Signal and noise in helioseismic holography | Astronomy & Astrophysics (A&A)

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Fig. 9.

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Meridional slice of the sound-speed kernel with z_s = 0.7 R_⊙ computed at the low frequency of 2.4000 mHz, which corresponds to the spike with a red dot in Fig. 7. This kernel displays oscillations and is not peaked as much as the 3 mHz kernel from Fig. 2.

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