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: xASL_im_Modulation.m
    path of file: ./repos/ExploreASL/Functions/ImageProcessing
    
    the code of the file until where you have to start completion: function xASL_im_Modulation(x)
%xASL_im_Modulation Combines the transformations to create Jacobians, &
% multiplies the standard space segmentations with these to create volumetric
% images for volumetric analyses
%
% FORMAT:       xASL_im_Modulation(x)
% 
% INPUT:        ...
%
% OUTPUT:       ...
% 
% -----------------------------------------------------------------------------------------------------------------------------------------------------
% DESCRIPTION:  Combines the transformations to create Jacobians, &
%               multiplies the standard space segmentations with these to create volumetric
%               images for volumetric analyses.
%
% -----------------------------------------------------------------------------------------------------------------------------------------------------
% EXAMPLE:      ...
% __________________________________
% Copyright 2015-2020 ExploreASL

fprintf('%s\n','Modulating PV images in standard space');

%% ------------------------------------------------------------------------------
%% 1) Create Jacobian determinants
% Assuming that the SPM flow field was calculated from the current position and only rigid-realign was applied

% Load the matrix of the T1w file
tNii = xASL_io_ReadNifti(x.P.Path_T1);
OriginalMat = tNii.mat0;
CurrentMat = tNii.mat;
DiffMat = CurrentMat/OriginalMat;

    
function xASL_im_Modulation(x)
%xASL_im_Modulation Combines the transformations to create Jacobians, &
% multiplies the standard space segmentations with these to create volumetric
% images for volumetric analyses
%
% FORMAT:       xASL_im_Modulation(x)
% 
% INPUT:        ...
%
% OUTPUT:       ...
% 
% -----------------------------------------------------------------------------------------------------------------------------------------------------
% DESCRIPTION:  Combines the transformations to create Jacobians, &
%               multiplies the standard space segmentations with these to create volumetric
%               images for volumetric analyses.
%
% -----------------------------------------------------------------------------------------------------------------------------------------------------
% EXAMPLE:      ...
% __________________________________
% Copyright 2015-2020 ExploreASL

fprintf('%s\n','Modulating PV images in standard space');

%% ------------------------------------------------------------------------------
%% 1) Create Jacobian determinants
% Assuming that the SPM flow field was calculated from the current position and only rigid-realign was applied

% Load the matrix of the T1w file
tNii = xASL_io_ReadNifti(x.P.Path_T1);
OriginalMat = tNii.mat0;
CurrentMat = tNii.mat;
DiffMat = CurrentMat/OriginalMat;

% Checks if there's no scaling between the mat0 and mat
for ii=1:3
	nr = max(norm(DiffMat(1:3,ii)),norm(DiffMat(ii,1:3)));
	if abs(nr-1) > 0.001
		warning('xASL_im_Modulation::Scaling during modulation');
	end