Assertion: microscope's image | /r/CapableOf | check the surface
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text: Constant height imaging is much more difficult than constant interaction imaging as the probe is much more likely to crash into the sample surface.[citation needed] Usually before performing constant height imaging one must image in constant interaction mode to check the surface has no large contaminants in the imaging region, to measure and correct for the sample tilt, and (especially for slow scans) to measure and correct for thermal drift of the sample.