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In page Enlightenment (Doctor Who):

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Enlightenment was first broadcast in a twice-weekly slot on BBC One during the first two weeks of March 1983. The story episodes averaged 6.8 million viewers, with the highest viewing figures being 7.3 million for the final episode.[citation needed] The episodes averaged 67.5% on BARB's Appreciation Index, with Part Four once again achieving the highest figures.[citation needed]