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<img src='content_image/370343.jpg'>

or 2D false color images showing the spatial distribution of gaps, shown in figure 2b-o. Us- ing simultaneously recorded topographic infor- mation, we can align gap maps taken at differ- ent temperatures, despite their being taken over 

slightly different areas with varying amounts of thermal drift and piezo creep. This is accom- plished by interpolating the two dimensional data in order to maximize the agreement be- tween temperatures. To avoid biasing the re- 

