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The present directory contains the following files: * peppers.tiff: used for an image denoising task with the Hessian-Schatten norm image regularizer, * peppers_Hessian_Schatten.npy: results of an image denoising task to exemplify the combination of the Hessian-Schatten norm regularizer with nonnegativity constraints, * phantom_Hessian_Schatten.npy: results of the same image denoising task with the Hessian-Schatten norm plus nonnegativity constraints, with the Shepp-Logan phantom, * phantom_TV_results.npy: results a similar image denoising experiment with nonisometric TV plus nonnegativity constraints, with the Shepp-Logan phantom. The rest of the data is generated or loaded inside the notebooks from standard Python packages.