Figure 4
From: Optimizing qubit performance through smoothing techniques

Detected and Predicted Hamiltonian Spectral Lines on two-tone spectroscopy maps of different qubits: The ’Determined’ lines represent the spectra of the Hamiltonian determined from identified extrema, while the ’Predicted’ lines are obtained through interpolation from selected extrema points on the spectroscopy maps (a) cubic spline, (b), (c) Lagrange interpolation.