confidence contours for column density vs. photon index for all pixels when the Crab is 3.0 arcmin off-axis

Figure 8: Confidence contours for N_H vs. Gamma for all pixels when the Crab is 3.0 arcminutes off axis. The box delineates the region shown in Fig. 7. Contours are 68%, 90%, and 99% confidence; those for the A pixels are solid lines.