Yes, David. Let's start with the Jubilee question and come up to margin in Senegal. Just wanting to clarify a point which we continue to make, which is 120,000 barrels a day is the production number and there is a shrinkage factor to go from sales to production. So, actually in the fourth quarter we had -- our gross sales were around 106,000 barrels a day, which actually on a production basis is probably -- you get the math wrong now, but about 112,000-113,000 barrels a day. So, actually in the fourth quarter, the field was pretty close to its 120. And of course that's an average for the quarter. So on certain days it was absolutely that. So, it's a mathematical problem that we need to keep going around, which is the conversion from production to sales, and then sales with maintenance build into it, which is really the issue for 2016 is that we've got a two-week shutdown. So we can't do the math when you put the two-week shutdown into it, you take the exit production rate from the fourth quarter of 2015, the numbers are pretty close. I think and internal piece is the production is going to be a little lighter I think in the first half, where we're catching up on some injection issues that we've had, but fundamentally the capacity is that. So I think's the -- the field continues to perform, and what I would highlight is the gas export has been remarkably reliable actually, given the nature of the system through to the gas pile generation. So that to me was one of the big risks that we have to remove in 2015. So I think that's the Jubilee production story. In terms of Mauritania and Senegal, again, just to be very clear, David, what I said was we're the process now of integrating on knowledge of the gas resource with the final appraisal well, our gas appraisal well, which is Ahmeyim-2. We then put that with the early thinking we got on the most competitive way to develop the resource, the concept thinking, that sort of going to come together by mid-year, and in parallel we are in discussion with a number of parties about that potential participation. We would make a decision on that participation in the second half of '16. And that would allow us then to move forward with the necessary work in '17 to bring this to an investment decision. So I think the investment decision in some ways out, at least for the backend of '17. So what we are looking to do I think is first is what's the right way to develop this resource and ensure we've got alignment with the potential partner around that.