Resonance and Numbers of Ties

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\documentclass[border=2pt]{standalone}
% Drawing
\usepackage{tikz}
\usetikzlibrary{shapes}
%% Styles
\tikzstyle{axis} = [line width = 0.8]
\tikzstyle{node} = [draw, rectangle, rounded corners, line width=0.5]
\begin{document}
    
    \begin{tikzpicture}
        % Grid
%       \foreach \i in {-8,...,0,...,10}
%       {
%           \node at (\i,-2ex) {\i};
%           \node at (0,\i) {\i};
%       }
        
        % n=1
        %% Node
        \node[node] at (-1,0) {$n=1$};
        %% Axis
        \draw[axis] (0,0) -- (2*pi,0);
        %% Green Line
        \draw[domain=0:2*pi, samples=100,  line width = 1, green] plot (\x, {1.5*cos(deg(0.5*\x))});
        %% Valus on Axis
        \draw[thick] (0,3pt) -- (0,-3pt) node[below] {$0$};
        \draw[thick] (pi,3pt) -- (pi,-3pt) node[below] {$\frac{L}{2}$};
        \draw[thick] (2*pi,3pt) -- (2*pi,-3pt) node[below] {$L$};
        
        % n=2
        %% Node
        \node[shift={(0,-3.5)}, node] at (-1,0) {$n=2$};
        %% Axis
        \draw[shift={(0,-3.5)}, axis] (0,0) -- (2*pi,0);
        %% Blue Line
        \draw[domain=0:2*pi, samples=100, shift={(0,-3.5)}, line width = 1, blue] plot (\x, {1.5*cos(deg(\x))});
        %% Values
        \draw[shift={(0,-3.5)}, thick] (0,3pt) -- (0,-3pt) node[below] {$0$};
        \draw[shift={(0,-3.5)}, thick] (0.5*pi,3pt) -- (0.5*pi,-3pt) node[below] {$\frac{L}{4}$};
 
 
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