Position Line Options | Scatter Plot

Hi Team,

I am trying to modify the scatter plot to divide it into quadrants by using the position line option. Currently, I am able to add a horizontal position line at a suitable position on the Y-axis. However, I am not able to figure out how I can add a vertical position line by giving a suitable value on the X-axis.

Please let me know how can I can draw the same.

Thanks in Advance,
Soham Potdar.