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: spm_preproc_write8.m
    path of file: ./repos/spm12
    
    the code of the file until where you have to start completion: function [cls,M1] = spm_preproc_write8(res,tc,bf,df,mrf,cleanup,bb,vx,odir)

    
function [cls,M1] = spm_preproc_write8(res,tc,bf,df,mrf,cleanup,bb,vx,odir)
% Write out VBM preprocessed data
% FORMAT [cls,M1] = spm_preproc_write8(res,tc,bf,df,mrf,cleanup,bb,vx,odir)
%__________________________________________________________________________
% Copyright (C) 2008-2016 Wellcome Trust Centre for Neuroimaging

% John Ashburner
% $Id: spm_preproc_write8.m 7415 2018-09-10 18:24:16Z john $

% Prior adjustment factor.
% This is a fudge factor to weaken the effects of the tissue priors.  The
% idea here is that the bias from the tissue priors probably needs to be
% reduced because of the spatial smoothing typically used in VBM studies.
% Having the optimal bias/variance tradeoff for each voxel is not the same
% as having the optimal tradeoff for weighted averages over several voxels.

if isfield(res,'mg')
    lkp = res.lkp;
    Kb  = max(lkp);
else
    Kb  = size(res.intensity(1).lik,2);
end