The authors are grateful to the EPSRC for financial support through the associated programme grant LightFORM (EP/R001715/1). J. D. Robson is grateful to DSTL and the Royal Academy of Engineering for funding through the DSTL/RAEng Chair in Alloys for Extreme Environments RC- SRF2021124. Luxfer MEL technologies are thanked for the provision of the alloy used in this study, D. Strong is thanked for conducting the rolling, and M. Kumar for the contrast correction code.

Submitted manuscript and data for paper "Grain-Scale In-situ Study of Discontinuous Precipitation in Mg-Al" Files: Manuscript: insitu_dp_pap.pdf Video: Mg DP.mp4 Area 1 image stack: Area_10xxx.tif Area 2 image stack: Aligned 752 of 7520xxx.tif Matlab code: boundarytracker.m, concprof_oblate.m (see code for details) Figures and associated data: *.fig (Matlab figure format), *.txt (ASCII text format)