Histogram of the ground truth. This is needed for comparison when evaluating the performance of the algorithms described in the article 'Improved dynamic imaging of multiphase flow by constrained tomographic 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