\title{Building Surrogate Model for Cauchy-characteristic extraction (CCE) Waveforms}

With recent improvements in the Cauchy-characteristic evolution (CCE) procedure, the CCE waveforms could soon become the new standard method of extracting gravitational waveforms at $\mathcal{I}^+$ from numerical relativity simulations. The CCE waveforms are gauge-invariant (up to BMS transformations). Unlike extrapolated waveforms, they include memory effects, which could be observed with the next-generation detectors. In this talk, we present the first surrogate model built with CCE waveforms, NRSur3dq8\_CCE. This aligned spin model is trained over the same 3-dimensional parameter space as previous model NRSur3dq8, but now with new CCE waveforms: $q \leq 8 \text{ and  } \vert\chi_{1z}\vert,~ \vert\chi_{2z}\vert  \leq 0.8$. To ensure that waveforms start in the same frame, we have performed BMS frame fixing on the CCE waveforms.