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The present setup introduces a new length scale , i . e . , the inter - chromophore distance , which breaks the aforementioned scale invariance and enables one to determine independently the concentration of the environmental fluctuations and their coupling to the chromophores , by monitoring the time after which spectral diffusion of distinct chromophores becomes uncorrelated .
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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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