Ground truth used for forward projection in the article 'Improved dynamic imaging of multiphase flow by constrained tomographic reconstruction'. The forward projections can be reconstructed and compared to with the file simulation_attenuation_rotated.npy https://doi.org/10.11583/DTU.14553741 to check the quality of the reconstruction. The code can be found at https://gitlab.gbar.dtu.dk/pwra/NumericalExperiments This item is a part of the collection: Data for "Improved dynamic imaging of multiphase flow by constrained tomographic reconstruction”, https://doi.org/10.11583/DTU.c.5448594