Snapshots of the \((\ell, m)\)-mode amplitudes, normalized to the \((2,2)\) mode, at selected times \(t\) relative to the peak of the \((2,2)\) mode, displayed on a grid of \(\chi_{1z}\) and \(\chi_{2z}\). Best-fit surfaces based on the leading-order fits defined in Eq. (1) of the paper are shown. The best-fit surfaces were obtained using data from the
SXS catalog only. Colors indicate the modes displayed in each row, and markers denote the numerical relativity catalog associated with each data point.
