Distributions of COMPT χ² – test model χ² for three SGR 1806−20 bursts. Blue shaded regions represent rejection regions of the seed (COMPT) model (where ﹩{\chi }_{\mathrm{COMPT}}^{2}-{\chi }_{\mathrm{Test}\,\mathrm{Model}}^{2}\gt 3.84﹩). (a) Test model: BB+BB for Burst ID: 20. (b) Test model: BB+PO for Burst ID: 1. (c) Test model: LB+LB for Burst ID: 5.