BELLA multilateration of the Type III SRB. (a) Top view of the ecliptic plane showing the location of the spacecraft and the multilaterated burst. A background map generated by simulated data tests the performance of BELLA for this particular spacecraft configuration at the location of the sources; (b) zoom-in of the burst; (c) same zoom-in, but the multilateration was performed on the output of the GH polynomial without the final fit of the Type III. We found that BELLA showed results with a confidence area of ∼15 − 20 R_⊙ in diameter. The TDOA results from the method in Badman et al. (2022) and SEMP have also been included for the purpose of validating the results obtained by BELLA. Parker spirals show the results from fitted BELLA points (black) and SEMP (red) at 400 km s⁻¹, with dashed lines indicating the uncertainty at ±20 km s⁻¹. We found that there are some systematic differences between TDOA/BELLA (ϕ₀ ∼ 30°) and SEMP (ϕ₀ ∼ 20°), but they are consistent within the error bars that BELLA allows to be quantified.