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Table A.1

Center positions of the fitting window and the fitted phase times.

Δ
(deg) (min) (min) (min) (min) (min)
6 44.79 47.5 47.25 44.44 44.42
9 52.55 55.5 54.75 52.02 52.02
12 58.84 61.5 61.50 58.49 58.49
15 64.17 66.5 66.75 63.81 63.80
18 68.82 71.5 71.25 68.50 68.49
21 72.94 75.5 75.75 72.61 72.61
24 76.62 79.5 78.75 76.31 76.31
27 79.95 82.5 82.50 79.65 79.64
30 82.97 85.5 85.50 82.66 82.66
33 85.71 88.5 88.50 85.40 85.39
36 88.23 90.5 90.75 87.89 87.88
39 90.53 93.5 93.00 90.18 90.18
42 92.63 95.5 95.25 92.32 92.31
45 94.58 97.5 96.75 94.29 94.28
48 96.43 98.5 99.00 96.21 96.21
51 98.20 100.5 100.50 97.94 97.93
54 99.90 102.5 102.75 99.63 99.63
57 101.53 104.5 104.25 101.21 101.19
60 103.08 105.5 105.75 102.74 102.73

Notes. The group time, , based on the ray approximation is used as the reference time to determine the fitting window. Modes with frequency of 3.33 mHz are used in the ray approximation. Because the theoretical are roughly half a period (2.5 min) smaller than the observed group times (the center position of the fitted Gaussian envelope) for travel distances in this regime, we round off the plus 2.5 min to the nearest grid point as the center position of the fitting window, τctr. The position of CCF’s peak closest to is used as the initial guess for the phase time, τph, in the fitting. The fitted τph for the CCFs in Fig. A.1 are listed in the table for comparison.

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