Pgfplots: how do I fill an area over a curve?

Question

I'm working with pgfplots, and I have a curve on a graph which is basically a rect. I would like to color the part on top of it, not the part under it. I have this code:

\addplot[fill=\sixthplotcolor, fill opacity=0.5, thick, mark=none, color=\sixthplotcolor]
coordinates {
    (1, 40)
    (10, 400)
    (100, 4000)
    (150, 6000)
    (200, 8000)
    (250, 10000)
    (300, 12000)
    (350, 14000)
    (500, 20000)
    (750, 30000)
    (1000, 40000)
} \closedcycle;

Which colors under the curve, but not over.

Can anyone help me? Sorry for the dumb question, I'm new to pgfplots.

Answer 1

As given in the comments, for this specific example using a predefined special coordinate and orthogonal lines can be used to achieve the goal.

\documentclass{article}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\begin{axis}
\addplot[fill=red, fill opacity=0.5, thick, mark=none]
coordinates {
    (1, 40)
    (10, 400)
    (100, 4000)
    (150, 6000)
    (200, 8000)
    (250, 10000)
    (300, 12000)
    (350, 14000)
    (500, 20000)
    (750, 30000)
    (1000, 40000)
} -| (current plot begin);
\end{axis}
\end{tikzpicture}
\end{document}