Article: In the United States and Canada, the film opened on 6 November 2015, and in its opening weekend, was originally projected to gross $70–75 million from 3,927 screens, the widest release for a Bond film. However, after grossing $5.25 million from its early Thursday night showings and $28 million on its opening day, weekend projections were increased to $75–80 million. The film ended up grossing $70.4 million in its opening weekend (about $20 million less than Skyfall's $90.6 million debut, including IMAX previews), but nevertheless finished first at the box office. IMAX generated $9.1 million for Spectre at 374 screens, premium large format made $8 million from 429 cinemas, reaping 11% of the film's opening, which means that Spectre earned $17.1 million (23%) of its opening weekend total in large-format venues. Cinemark XD generated $1.85 million in 112 XD locations.

Now answer this question: How much money did preview showings generate in the US and Canada?
$5.25