Radio 10 GHz light curve of SN 2023fyq with various model fits. We show the best-fit SSA and FFA models at 10 GHz (where these are fits from Equations (1) and (3) to the entire dataset derived in Section 3) along with a model taken from S. C. Wu & D. Tsuna (2025; the “merger model”) described in Section 3.1. This merger model has a similar shock speed ∼9000 km s⁻¹ but a different α = 0.55 and slightly different ϵ_e and ϵ_B. The merger model cuts off at ∼220 days, as this is when D. Tsuna et al. (2024) constrain the mass loss to begin for these merger models. The 3σ upper limits in black are not taken into account for the fits for any of the models.