Sure Paul. I'll take that. Basically if you go to anyone who has the deck opened slide 31 shows that. So there's lots of ways to measure performance. Specific measure that we use is the cleanest as to where we look at over the last year top 50 wells from an IP standpoint, where are they? Who has them? And then you can see on the left, we've got 20 of the top 50 over the last year. We've showed this for several quarters, so you can see moves around and how it progress. And 40% of those were the top operators when you look at the data. Another thing we add to it, on the right, which is something we often talk about is, we are able to do it with less proppant. And the reason we highlight that is twofold; one, it’s a big cost driver. Obviously you all know, the more profiting in pump, the more cost. But two, its really indicates how we customize our development. You can see we don’t have a universal number where we use 2,000 pounds per foot on every well, we vary it. And that’s a function of our development strategy and our understanding on the subsurface to get really, really good wells in a customizable way. The other thing I'd point you to, Paul, one thing we put in there, because the question we keep getting asked all the time is, are results continuing to improve? And it seems like every time we show a comparison of results, they are normalized by something, or you cherry pick which wells you use, you exclude this, you include this. So we include a slide in this deck that I'll point out slide 28. So what this slide is, it shows our six-month performance for every horizontal well. We didn't cherry pick which wells that go in there, all appraisal wells, all development wells, all of our wells are in every year that you can see for 2015, 2016, 2017 and 2018, across Midland Basin, New Mexico, Texas, Delaware and it answers the fundamental question of are we able to continue to improve? And you can look at each year and there's reasons that vary on why we're improving. Some years, it may be more of the lateral length, some years it may be better completions. Every year is being driven by a better understanding of the subsurface. And so, there's lots of things driving it. But the fundamental question of are we continuing to improve, I think, is answered with this slide. And what makes it even more impressive is, when you dig in to the details and you look at 2018, that's with 90-plus-percent of wells that have an offset, so characterized as children wells. So the big debate on our children wells, versus some parent wells, we can have that discussion. But fundamental, you can look at for many different reasons; we continue to get better well performance every year.