Control, control history, error and monitor signal

[shivam-kr-sharma]

(32)

After I lock the laser, I see a plot in which four lines are shown. These are error, monitor signal, control and control history. I also see some numbers below like error std. and Control std. I wanted to know what each of these lines actually mean, and the numbers also.
What I can think of till now is monitor signal and error which I see after locking the laser is same as I see them before locking. But before locking, since the sweep is on, we can see all the peaks across the sweep. But I am not sure about these as well.
Can someone please explain what these four lines are actually showing?