Procedure of finding ν_br as described in Sect. 3.5. The units in the logarithmic axes are arbitrary. The black dots show the synthetic flux density measurements generated with BRATS (Harwood et al. 2013, 2015). The dashed line shows the extrapolated power-law spectrum with the α_inj exponent. The solid line shows the extrapolated best-fit power-law spectrum to the flux density measurements. The intersection of the two functions is marked as (ν₀, P₀). ν_br is found by solving the Equation (5).