Just a quick question, a few months ago I modelled up a bottle and today I've had to modify it and I came across a cronstruction sketch, but I don't know what type of sketch it is. I can't remember how I constructed it. It doesn't seem to be a standard sketch plane type or a 3D type I don't think. Can anyone tell me what it is?

See image attached, its the last sketch called "Upper Lip Guide 2"