Electron spin oscillation with and without Earth's magnetic field

I came across this in an 'Up and Atom' video on YouTube, hosted by Jade Tan-Holmes. It is the third video in her quantum-biology series, about bird navigation, at 13:30 of the video....

The one axis is obviously just time, measured in microseconds....

But what exactly is the other axis?

$P_s$ (t) I don't get it....


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