Red dash line on display above focus box

[bazmaz]

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Might be a silly question - but on my Q2 when set with the Horizon line active - there is also a small red dash line in the centre about 3 mm above the horizon line.

Anyone know what that represents?

 

[jaapv]

Vertical horizon. Try tilting your camera up and down. 

[bazmaz]

But of course... d'oh!!

Thanks!