χ² distributions (blue curves) from coarse grid evaluation of each free spectral parameters. From top to bottom, the panels show (1) AME peak frequency, ν_p; (2) synchrotron spectral index, β_s; and (3) free-free electron temperature, T_e. The minimum χ² value for each parameter has been subtracted in each case. Orange curves show the priors adopted for the given component; see Table 1. The prior values for β_s and ν_p have been scaled by a factor of 100 to fit in the plot with the derived χ² values.