Synchrotron X-ray fluorescence microscopy of Cu, Fe, Mn and Zn in grain of the genotype TSN1. A. Light microscope image of the longitudinal grain section (dorsal side on
top). B. Element concentration maps. C. Element concentration profile from selected area (white box). The data was obtained by using the transect function in GeoPIXE over an area
201 pixel wide. Red dashed lines shows the thickness of the layer of grain material that was abraded by 8e10% polishing.