So there's, let me actually, let me draw W a little bit differently. So W might look like this, W might look like this. So what they're saying is find the tangent line, find the slope of that tangent line at T equals zero. So there's some slope right over there. And then we can use to approximate, we can use this slope to kind of create a linear approximation of where we're gonna be a quarter of a year from then. So if you go, so although we don't know what W is just yet, we could take the slope of this line out to T is equal to, so this is our T axis, to T is equal to 1 4th, and wherever that line takes us out after a fourth of year, that will be at least a decent approximation. We're extrapolating forward from that first point and the current slope.