% show loaded objects
x = xff

% select vmp (9th object)
vmp = x(9);

% then set the data
vmp.Map.VMPData = single(difft);

% and set the name and DF1 parameters (DF1 = N - 3, see depcorrt!)
vmp.Map.Name = 'Differential correlation (A>B, tas_desc) > (C>D, tas_desc)';
vmp.Map.DF1 = 13;