Magnetic and thermodynamic quantities derived from the surface at R = 21.5 R_⊙ in the COCONUT simulation. The panels represent the density, the temperature, the three components of the magnetic field (B_rB_clt and B_lon), and the three components of the velocity (V_rV_clt and V_lon). These panels show the surface at the initial moment of the COCONUT simulation, where a CME modelled by the TDm model with ζ = 35 is implemented. These interpolated surfaces, derived from the unstructured mesh of COCONUT and saved in a coupling text file, are used throughout the relaxation phase to build up the solar wind in EUHFORIA.