Two baselines: the highlighted band is visual reference (−0.20 to +0.20). Your point baseline hugs the lower edge of that band (around −0.20) and can pop slightly above it on good baseline days. Added a red "typical person" line with its own tail: stays inside the band ~95% of the time, may have a brief low once per year and a couple of "on-top-of-the-world" days.