Three-dimensional Iso-surface plot of the scaled density obtained from EUHFORIA simulations. The sphere at the center represents the inner coronal boundary of EUHFORIA at 0.11 AU. Magenta spheres represent the radio source positions of Event 8. The radio sources are not plotted according to their actual sizes. Blue, red, and green spheres represent PSP, STEREO-A, and Earth positions, respectively. The magenta, red, blue, and green lines represent the magnetic field lines connecting the radio source at 775 kHz, STEREO-A, PSP, and Earth to the Sun, respectively. Panels (a) and (b) show 3D representation of the EUHFORIA density obtained using GONG and ADAPT magnetograms, respectively.