Param joint crab paper gammapy amplitude 3.491e-11 ± 3.045e-12 3.580e-11 ± 3.105e-12 alpha 2.542e+00 ± 2.247e-01 2.578e+00 ± 2.227e-01 beta 4.249e-01 ± 3.127e-01 4.147e-01 ± 3.171e-01
