You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: plot_struc_function.m
    path of file: ./repos/OPEN_FPE_IFT/.previousVersions/V4 Functions
    
    the code of the file until where you have to start completion: %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% This function plots the $k$-th order structure function $S^{k}(r)$ with $k={1-7}$ for scales 
% $\lambda \leq r \leq L$. Dashed line represents -4/5 law. The 4/5 law states that 3rd-order 
% structure functions of longitudinal velocity increments should scale linearly with their 
% displacement distances. The 3rd-order structure function is one of the mos
    
function plots the $k$-th order structure function $S^{k}(r)$ with $k={1-7}$ for scales 
% $\lambda \leq r \leq L$. Dashed line represents -4/5 law. The 4/5 law states that 3rd-order 
% structure functions of longitudinal velocity increments should scale linearly with their 
% displacement distances. The 3rd-order structure function is one of the most fundamental of all 
% Navier-Stokes equation results; it is exact, with no adjustable constants, so any model that is 
% expected to produce accurate turbulence results must reasonably well duplicate this. 
%
% Arguments IN
% r_n = Number of seperated scales between Integral and Taylor (calculation of structure functions)
% Fs = Acquisition/Sampling Frequency in Hz
% data = it is the filtered data 
% m_data = mean of the data
% int_L = Integral length scale in meters
% taylor_L = Taylors length scale in meters
%
% Arguments OUT
% r = scales between Integral and Taylor (calculation of structure functions)
% S_exp = $k$-th order structure function $S^{k}(r)$ with $k={1-7}$
% Lam_sq_L_1 = shape parameter
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function [r,S_exp_2,S_exp_3,S_exp_4,S_exp_5,S_exp_6,S_exp_7,Lam_sq_L_1,Lam_sq_L_2,Lam_sq_L_3,T_exp_3,T_exp_5,T_exp_7,exponent]=plot_struc_function(r_n,Fs,data,m_data,int_L,taylor_L,mu,D,norm_r,save_path)
set(groot, 'defaultAxesTickLabelInterpreter','latex'); 
set(groot, 'defaulttextinterpreter','latex');   
set(groot, 'defaultLegend