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This work is a first step toward the theoretical interpretation of numerous methane bands which remain still unassigned and detailed line - by - line absorption / emission spectra analyses for atmospheric and planetological applications .
 Chemical: methane
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: methane