LV and CTR are funded by Sir Henry Dale Fellowships awarded jointly by the Wellcome Trust and the Royal Society [221805/Z/20/Z and 098436/Z/12/B, respectively]. AA is funded by a British Heart Foundation clinical research training fellowship [FS/17/18/32449]. AIS is funded by the Austrian Science Fund (FWF) Schr��dinger Fellowship [J 4043]. SN acknowledges support from the Oxford NIHR Biomedical Research Centre and the Oxford British Heart Foundation Centre of Research Excellence. DJT acknowledges support from a British Heart Foundation Senior Fellowship (FS/19/18/34252). Support of the Slovak Grant Agencies VEGA [2/0003/20] and APVV [#19���0032] is also gratefully acknowledged. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

The uploaded data relate to the work of Valkovi�� et al. entitled "Increased Cardiac Pi/PCr in the Diabetic Heart Observed Using Phosphorus Magnetic Resonance Spectroscopy at 7T." submitted in 2022 The data consist of the anonymised in vivo data of healthy volunteers and T2DM patients, in Siemens DICOM format, acquired as described in the manuscript. The uploaded data also include all analysed STEAM data results with visualised MR spectra and fitted values of PCr and Pi, used for Pi/PCr calculation.