% enable transio for VTC data
xff(0, 'transiosize', 'vtc', 5e5);

% load MSK and VTC
msk = xff('*.msk', 'Please select a mask file...');
vtc = xff('*.vtc', 'Please select a VTC file...');

% check objects
if isxff(msk, 'msk') && isxff(vtc, 'vtc')

    % get mask indices
    maski = find(msk.Mask(:));
    
    % read only the data we need
    maskedvtcdata = vtc.VTCData(:, maski);
end

% clear objects
clearxffobjects({msk, vtc});