The GSF polymorphs and ICs with PEG have similar unit cell parameters, which, along with their presence in varying amounts, made the minor phases in the melt crystallisation product impossible to be identified by PXRD. High quality 3D ED data was collected for accurate unit cell determination in order to identify the six phases in the polycrystalline GSF/PEG melt crystallisation product. This is well supported by the dendrogram showing the results of the clustering analysis based on unit cell parameters (Figure ) and the small deviations of the unit cell parameters determined from individual crystals (Table ). Furthermore, by calibrating the eucentric height for each crystal before data collection, 3D ED dataset could be collected over a large rotation range. The high completeness of individual dataset allowed directly structure determination of the six phases found in the spherulite. This is a significant improvement in high-throughput 3D ED/MicroED analysis.