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: ft_volumerealign.m
    path of file: ./repos/spm/external/fieldtrip
    
    the code of the file until where you have to start completion: function [realign, snap] = ft_volumerealign(cfg, mri, target)

% FT_VOLUMEREALIGN spatially aligns an anatomical MRI with head coordinates based on
% external fiducials or anatomical landmarks. This f
    
function cb_maxslider(h5, eventdata)

tag = get(h5, 'tag');
newlim = get(h5, 'value');
h = getparent(h5);
opt = getappdata(h, 'opt');
if isempty(tag)
  opt.clim(2) = newlim;
elseif strcmp(tag, 'rel')
  opt.realignclim(2) = newlim;
elseif strcmp(tag, 'tar')
  opt.targetclim(2) = newlim;
end