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The precision error in vivo for segmentation and quantification of porosity in HRpQCT images at the distal radius , given by the root mean square error of the coefficient of variation , ranged from 0 . 54 % for porosity of the transitional zone to 3 . 98 % for area of the compact - appearing cortex .
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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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