Best fitting models in blue to the observed lines in black for B331. The blue shaded regions indicate models that fall within the 1 σ confidence interval. Each line is Atted individually with the inclination Axed at 75°, the respective parameters are shown in Fig. 5. The orange proAles indicate the best At when Atting Pa-16 to Pa-9 and Br-16 to Br-11 simultaneously. Notice the factor ~20 range in line strengths covered by the Paschen series.