It is clear that sample is too dirty that affect tip behaviour. The image show the data f=got from DI/Veeco system. if you try to find very sharp tip to get good image is possible. But the tip will be containmated during engaging or first scan. If you change tip and get the good data. it is lucky. From the image shoq upper part is not feedbcak. lower right part fedback. This is becaus center part show contaimaent ther and make system feedback abnormal. The best way is to change offset when tiy see center contianmanation right away.
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