I understand that the n value is for the Hill Coefficient and x0 is the IC50 or EC50, basically the point where the response is 50% of the maximum. What I don't understand is, what is this x1 where the tangent has been drawn? While I can see the expression for it, I don't get by what it means?
"x1" is the X value of the point, the second derivative of Y of which is zero(y''=0). At this point, the slope of the tangent line has the biggest value.