Actual O–C diagram for the eclipse times of N1425 (the last minimum obtained in November 2020). The individual primary minima are denoted by circles, the secondary by triangles. The blue sinusoidal curve with the short period of about 14 years clearly fits all data up to the epoch 40 000 (September 2019), but it does not follow the last mid-eclipse times measured after this date (red dashed curve).