2021-01-01  30 mins

2021-01-14  30 mins

2021-02-02  30 mins

2021-03-06  30 mins

2021-03-07  40 mins

2021-03-12  120 mins

2021-03-22  120 mins

2021-03-26  120 mins

2021-11-26  30 mins

2021-12-26  30 mins

2022-01-26  30 mins

2022-02-26  30 mins (waiting for processing)

2022-03-26  30 mins (waiting for processing)

2022-04-26  30 mins (waiting for processing)

We use DD model to fit and we get:

The PA shift is confirmed to be the effect of ionosphere rotation measure. The ephemeris is from Weisberg, 2016.