how to get coefficients out of scattergram?

Hello,

I have input a 1d signal on amplitude versus time of an ECG signal as y in the below code

Fs = 12000;
sf = waveletScattering('SignalLength',numel(y),...
    'SamplingFrequency',Fs);
[S,U] = scatteringTransform(sf,y);
scattergram(sf,U,'FilterBank',1)

I get out a very nice scattergram that shows frequencies versus time

however, I am not sure how to get out a 1d vector out of this scattergram so that I am back having a sgnal of amplitude versus time.

Anyone knows?

SOLVED:

The info I am looking for is in U{1, 1}.coefficients{1,1}

Thanks in advance.