Comparison between the hard and soft fluxes for each mission with hard detections (i.e., >2 keV). The black lines show the expected behavior of the spectral assumption (absorbed power law of N_H = 3 × 10²⁰ cm⁻² and Γ = 1.7), and the black dotted lines show a departure by a factor of 5 from this behavior. While the spread around the assumed shape can appear significant, it is important to remember that the error bars on these hard and soft fluxes are significant as well (typically signal to noise ratio of about 3 or less), so the statistical significance of the spread is reduced