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This method is used in flame emission spectroscopy , and it was also the method used by Anders Jonas Ångström when he discovered the phenomenon of discrete emission lines in the 1850 s .
 person: Anders Jonas Ångström
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Anders Jonas Ångström