Table 1 Fitting parameter and R² values corresponding to the longitudinal curve shown in Figure 1a (code IVS3)

ivs3

59.61

57.43

55.10

56.31

y₀(cm)

0.11

0.14

0.16

0.13

β₀(1/yr)

−0.09

−0.14

−0.15

−0.12

t_{m 1}(yr)

2.60

y₁(cm)

0.01

β₁(1/yr)

−1.34

a₁(1/yr)

12.63

σ₁(yr)

0.02

t_{m 2}(yr)

14.87

14.63

14.89

y₂(cm)

12.45

17.42

15.81

β₂(1/yr)

−0.11

−0.84

−2.38

σ₂(yr)

1.18

0.93

R ²

0.991

0.996

0.998

0.999