Shade area in between a value.

[something123]

Hello, does anyone know how can I shade the value covering the midpoint (50) instead of shading the whole chart? (I want to shade the little white area below 50 on the y-axis instead of the other side, if that makes sense)

Thanks!

[lbendlin]

Please provide sanitized sample data that fully covers your issue.

Please show the expected outcome based on the sample data you provided.