Peak Width

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\documentclass[border=2pt]{standalone}
% Drawing
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
% Tikz Library
\usetikzlibrary{calc}
% Middle Line Label
\newcommand{\midlabelline}[3]{
   \node (midlabel) at ($ (#1)!.5!(#2) $) {\scriptsize#3};
   \draw[latex-] (#1) --  (midlabel);
   \draw[-latex] (midlabel) -- (#2);
}
% Define Color
\definecolor{chromeyellow}{rgb}{1.0, 0.65, 0.0}
\begin{document}
    
    \begin{tikzpicture}
        % Grid
%       \draw[help lines] (0,0) grid (8,8);
        
        % Axis
        \draw (0,0.4) -- ++(7,0) node [right] {\small$\omega$};
        \draw (0.4,0) -- ++(0,6) node [above] {\small$\langle P \rangle$};
        
        % Plot
        \begin{axis}[
            xtick=\empty,
            ytick=\empty,
            axis line style={draw=none},
            ]
            %
            \addplot[chromeyellow, samples=300, very thick] {50/(2+ (1.5*x - 1/(1000*x))^2)};
        \end{axis}
        
        % Text Labels
 
 
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