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Viewership details won’t be available until Tuesday, but overnight ratings suggest good — but not spectacular — interest Sunday night for the premiere of Caitlyn Jenner’s E! docuseries “I Am Cait.”

In Nielsen’s metered-markets, “I Am Cait” averaged a 2.1 household rating to tie with TNT’s “The Last Ship” as the top cable program of the night. Other top cable shows were HBO’s “True Detective” (1.5), TNT’s “Falling Skies” (1.5) and HBO’s “Ballers” (1.2). Last week, a similar overnight rating for “The Last Ship” translated into a little over 3 million viewers.

Review: I Am Cait

In May, a two-night “All About Bruce” episode of “Keeping Up With the Kardashians” averaged about 2.75 million viewers in Nielsen’s “live plus same-day” national estimates, or nearly 40% more than the show’s prior three-week average with regular episodes.

An estimated 87,000 Tweets about “I Am Cait” reached a unique audience of 2.77 million on Sunday night, according to Nielsen Twitter TV Ratings. That makes it the week’s No. 1 series in unique audience reached, solidly ahead of No. 2 “The Bachelorette” on ABC (2.23 million).

According to ListenFirst’s Digital Audience Ratings for Television, which measures digital engagement across the television landscape, Sunday’s premiere of “I Am Cait” generated roughly 1.64 million engagements — about as many as the combined recent recent E! premieres of “Keeping Up With the Kardashians” in March (1 million), “Botched” in April (433,000) and “Total Divas” earlier this month (225,000). The measurement is based on an algorithm that examines fan engagement with television programs across Facebook, Google, Instagram, Tumblr, Wikipedia and YouTube.