Supplementary material for the article "Asteroid Itokawa … but when and how did it form exactly?"

The Supplementary material includes a Supplementary Text describing in details the Scanning electron microscopy methods, the Simultaneous electron backscatter diffraction and energy dispersive spectroscopy mapping and the Backscattered electron and secondary electron imaging. It also includes a caption for the supplementary datasets. Full 40Ar/39Ar dataset for each of the three particles are provided in Supplementary Datasets 1-3 as Excel files.

本补充材料包含一份补充文本，详细阐述了扫描电子显微镜（Scanning electron microscopy）实验方法、同步电子背散射衍射（electron backscatter diffraction）与能量色散能谱（energy dispersive spectroscopy）测绘技术，以及背散射电子成像与二次电子成像的相关方法。该补充文本同时附带了补充数据集的图注。三份颗粒各自的完整40Ar/39Ar数据集已作为Excel文件收录于补充数据集1-3中。