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Here we present experimental evidence of spatial variations in the lowest available electron transition energy within a series of single electrically isolated QDs due to a dome - shaped geometry , measured using electron energy - loss spectroscopy in a ( scanning ) transmission electron microscope [ ( S ) TEM - EELS ] .
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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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