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: SepiaIOWrapper.m
    path of file: ./repos/sepia/wrapper
    
    the code of the file until where you have to start completion: %% [chi,localField,totalField,fieldmapSD]=SepiaIOWrapper(inputDir,outputDir,varargin)
%
% Input
% --------------
% input         :   input directory contains NIfTI files or structure containing filenames  
% output        :   output directory that stores the output (s
    
function availableFileList          = tf_00_bipolar_correction(sepia_header, algorParam, availableFileList, outputFileList, outputNiftiTemplate)

isEddyCorrect   = algorParam.unwrap.isEddyCorrect;

TE              = sepia_header.TE;

if numel(TE) < 4 && isEddyCorrect
    
    warning('Bipolar readout correction requires data with at least 4 echoes.');
    disp('Bipolar readout correction is  not performed.');
    isEddyCorrect = false;
    
end