How do I stop and start V-curves?

Sometimes I want to use other methods of focusing (specially with spectroscopy), or just using the focus view to drift align etc. However once started I can't seem to stop the V-curve data being acquired. If I don't keep hitting the clear data button, the amount of memory used freezes the whole of EKOS/kStars.

I'm sure this must be in the documentation somewhere, but for the life of me I cannot find it.

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