function[obj] = correct_for_baseline(obj, settings)
%% correction for baseline measure
%  The actual baseline is calculated in getBaseline
eyes = fieldnames(obj.data);
for e = 1:length(eyes)
    eye = eyes{e};
    
    signals = fieldnames(obj.data.(eye).uncorrected);

    baseline = getBaseline(obj, settings);
    obj.baseline = baseline;
    
    for i = 1:length(signals)
    
        signal = getfield(obj.data.(eye).uncorrected, signals{i});

        if (~isnan(baseline))
            %% apply the correction
            corrected_signal = (signal - baseline) / baseline; 
        else
            %% no correction is applied
            corrected_signal = signal;
        end
    
        obj.data.(eye).baseline_corrected = setfield(obj.data.(eye).baseline_corrected, signals{i}, corrected_signal);
    end
end