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Imagine that you are playing a game of Clue in which Mrs. White is killed in the conservatory. You have a device in each room to help you find the murderer: a spectrometer that detects the entire visible spectrum to indicate who is in that room. For example, if someone wearing yellow is in a room, light at 580 nm is reflected. The suspects are Colonel Mustard, Professor Plum, Mr. Green, Mrs. Peacock (blue), and Miss Scarlet.