Confidence intervals for independent power-law fits to low- and high-hardness data; crosses represent the best fit. The contours correspond to 1σ (red, dashed), 90% (green, dash-dotted) and 99% (blue, dash-dot-dotted) confidence intervals. The solid gray shaded region represents the values of Γ allowed when the power law slope is tied between the low- and high-hardness spectra; the light blue and gray patterned areas represent the corresponding allowed ranges for NH for low- and high-hardness spectra.
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