Period comparison: the data from the literature, in particular S99 (blue asterisks), H02 (red crosses), and K23 (open circles), are compared with the periods determined in our current study. The dashed lines indicate the 1-to-l relationship as well as the values for the double and half periods. Approximately 90% of the sources are within the 20% threshold of agreement. Nevertheless, there are two notable deviations: in one case, the period determined is significantly longer (10.96 days) than the value found in K23, and in another it is significantly shorter (0.91 days); see text.