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Fig. 3. The mass images at m/z 848.556 and 848.645 in a mass window of 0.1 u are shown in (a) and (b). Two compounds observed at m/z 848.556 and 848.645 were distributed in complementary locations. (c) The mass image in a mass window of 0.2 u, which includes m/z 848.556 and 848.645. The overlapped image of (a) and (b) are shown.