25718
Numerical simulations indicate that the spin bath polarization is nonuniform throughout the nanoparticle , averaging approximately 5 % over the crystal volume , but reaching up to 25 % in the immediate vicinity of the NV .
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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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