Using the EnergyDependentMorphologyEstimator object from gammapy.estimators to quantify any energy-dependent morphology in the source of interest. The energy_edges defined are used to investigate the potential of an energy-dependent morphology in the dataset. The gammapy.modeling.models is used to define a source model with a spectral and spatial component. The initial parameter values are taken from a previously optimised model based on the full dataset, which accurately represents the source’s morphology and spectrum. The position, extension, and amplitude are left free, as described in the text. The output of the code example is shown in Fig. A.1.