I am a C# developer that is brand new to this Quantconnect system.  I am looking at these Alpha Models, i.e. EmaCrossAlphaModel.  My question is, how do you get data out of these models?

I see in the initialization you do something like this:
AddAlpha(new EmaCrossAlphaModel(50, 200, Resolution.Minute));

But where do I access the data that comes from the Update?  Where do I get the Insights?  Where do I get the signal?

Do I get it from the Slice in the OnData method?  

I'm confused.

Thanks, in advance