The PARROT concept was recently published open access as original article in Microscopy & Microanalysis:

PARROT: A Pilot Study on the Open Access Provision of Particle-Discrete Tomographic Datasets R. Ditscherlein, O. Furat, E. Löwer, R. Mehnert, R. Trunk, T. Leißner, M. J. Krause, V. Schmidt, U. A. Peuker
DOI: 10.1017/S143192762101391X