Table 2: Coefficients of the Fourier fit to the $B_{\rm E}$ light curve with a period P = 5.5675 days between the epochs $E_{\rm b}$ and $E_{\rm e}$. $\Delta X$ represents the error in X. The error in R0 is similar to the mean error in $B_{\rm E}$, e.g. 0.029 mag, while the mean error in R1 is 0.003. All other quantities are defined in the text. The first row refers to the red line in the upper panel of Fig. 4. The other rows refer to a study completed for blocks of 100 measurements, for which the long-term variation was corrected.
$E_{\rm b} - 2$ 450 000 $E_{\rm e} - 2$ 450 000 R0 R1 $\phi_1$ R21 $\phi _{21}$ $\Delta R_{21}$ $\Delta \phi_{21}$
292.8648 2698.5268 16.125 0.082 0.274 0.101 4.573 0.022 0.220
292.8648 807.6200 16.118 0.146 0.284 0.245 5.636 0.022 0.092
488.5442 1037.7914 16.118 0.130 0.106 0.220 6.083 0.027 0.134
810.6014 1171.5550 16.121 0.118 -0.086 0.132 0.450 0.027 0.219
1039.7866 1340.8647 16.119 0.095 -0.160 0.026 1.773 0.030 1.161
1173.5735 1430.7374 16.118 0.093 0.029 0.083 3.687 0.044 0.524
1341.8360 1551.5909 16.122 0.090 0.398 0.128 3.542 0.054 0.414
1433.7395 1742.8458 16.120 0.098 0.733 0.096 2.364 0.037 0.401
1553.5609 1845.5713 16.122 0.099 0.841 0.134 2.064 0.036 0.274
1744.8375 1924.6267 16.137 0.074 0.862 0.186 2.067 0.055 0.309
1848.5785 2020.9232 16.132 0.048 0.763 0.248 2.516 0.077 0.335
1926.6210 2093.7241 16.120 0.043 0.525 0.227 3.272 0.071 0.334
2025.8887 2167.8788 16.122 0.047 0.245 0.217 4.169 0.066 0.344
2093.7841 2223.7505 16.113 0.043 0.157 0.225 4.459 0.062 0.319
2168.5507 2294.5823 16.113 0.044 0.557 0.195 3.862 0.058 0.299
2224.7489 2446.7581 16.121 0.050 0.506 0.161 4.723 0.067 0.447
2297.5690 2546.5336 16.125 0.057 -0.012 0.158 0.336 0.056 0.368
2448.7357 2622.5676 16.120 0.050 -0.250 0.083 1.267 0.061 0.748


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