The blue histogram is the T_s distribution for the empty Galactic region when the null hypothesis for a source at the position (l, b) = (160, 0)° is true, T_ss = 4, t_lcl = 5.99147, and both the flux and position of the source are allowed to vary. Black line is the best-fit function described in Eq. (4), N₂ = 5. The red dotted line is the theoretical distribution, the green dashed line is the theoretical distribution, and the cyan dotted-dashed line is the distribution.