Table 4
O–C diagram: fitted (top four rows) and calculated (bottom four rows) parameters.
| Quadratic fit | Cubic fit | ||
|---|---|---|---|
| a0 | – | (−7.02 ± 0.50) × 10−3 | (−9.64 ± 0.48) × 10−3 |
| a1 | – | (−2.08 ± 0.02) × 10−6 | (−2.38 ± 0.03) × 10−6 |
| a2 | – | (−7.03 ± 0.05) × 10−11 | (−6.43 ± 0.06) × 10−11 |
| a3 | – | – | (2.14 ± 0.14) × 10−16 |
| Residual | – | 1.30 × 10−1 | 1.03 × 10−1 |
| Ṗ | day yr−1 | (−1.85 × 0.01) × 10−7 | (−1.69 × 0.02) × 10−7 |
| Ṁ | M⊙ yr−1 | (−1.21 × 0.05) × 10−7 | (−1.11 × 0.05) × 10−7 |
 |
day yr−2 | – | (3.0 × 0.2) × 10−12 |
 |
M⊙ yr−2 | – | (2.0 × 0.2) × 10−12 |
Notes. The a0, a1, a2 and a3 are the fitted constant, first-order, second-order and third-order coefficients, respectively. The residuals are the sum of squared residuals. Ṗ and Ṁ are the period variation and the mass-transfer rate, respectively, while 
and 
are the temporal variation of the previous parameters, respectively.
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