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: icatb_dualcodeImage.m
    path of file: ./repos/gift/GroupICAT/icatb/icatb_display_functions
    
    the code of the file until where you have to start completion: %--------------------------------------------------------------------------
% Sample Matlab code for creating images with hue and alpha color-mapping.
%
%  Notes for using this code:
%  You must have OpenGL available on your system to use transparency (alpha). 
%  When rendering transparency MATLAB automatically uses OpenGL if it is
%  available. If it is not available, transparency will not display. 
%  See the figure property RendererMode for more information.
%
% EA Allen August 30, 2011
% eallen@mrn.org
%---------------------------
    
function cdata = icatb_dualcodeImage(Bmap_N_S, Tmap_N_S, Pmap_N_S, Underlay, cmap)


%% 2. Set some defaults that will affect the appearance of the image
%--------------------------------------------------------------------------
% Set the Min/Max values for hue coding
absmax = max(abs(Bmap_N_S(:))); 
H_range = [-absmax absmax]; % The colormap is symmetric around zero

% Set the Min/Max T-values for alpha coding
absmaxT = max(abs(Tmap_N_S(:))); 
A_range = [-absmaxT, absmaxT];
% Voxels with t-stats of 0 will be completely transparent; 
% voxels with t-stat magnitudes greater or equal than 5 will be opaque.

% Set the labels for the colorbar
hue_label = 'Beta Difference (Novel - Standard)';
alpha_label = '|t|';

CM_under = cmap(size(cmap, 1)/2 + 1:end