Magnetic Resonance Imaging measurement data for the following publication: "Free-Breathing Myocardial T1 Mapping using Inversion-Recovery Radial FLASH and Motion-Resolved Model-Based Reconstruction" Magnetic Resonance in Medicine, DOI:10.1002/mrm.29521 Part 1/2: DOI:10.5281/zenodo.5707688 Part 2/2: DOI:10.5281/zenodo.7350323 The data is provided in a file format used by the BART toolbox. DOI:10.5281/zenodo.592960