22802
Imaging at sub - 50 pN in the elastic regime can only be achieved under strict conditions in terms of force constant values ( below 0 . 1 N / m ) and free amplitudes ( below 2 nm ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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