Context: For their annual Thanksgiving Day game, the Lions hosted a rematch with division rival the Minnesota Vikings, with both teams coming into the game at 6-4 and the winner gaining first place in the NFC North. The Lions opened the scoring in the first quarter via a two-yard touchdown pass from Matthew Stafford to Anquan Boldin. The Vikings responded with a five-yard touchdown run from Matt Asiata. In the second quarter, the Lions recorded a 29-yard field goal from Matt Prater, which made the score 10-7 in favor of the Lions at halftime. The Vikings again tied the score in the third quarter via a 30-yard field goal from Kai Forbath, and took their first lead of the game in the fourth quarter via a 28-yard field goal from Forbath. The Lions responded with a 48-yard field goal from Prater to tie the game. With 38 seconds left in the fourth quarter, Darius Slay intercepted a pass from Sam Bradford. Two plays later, Prater recorded a 40-yard field goal as time expired, giving the Lions a 16-13 win. The Lions have trailed in the fourth quarter of every game this season, and tied an NFL record for the most fourth quarter comeback wins in a season with seven, set by the 2009 Indianapolis Colts. The Lions extended their own NFL record of games to start a season being decided by seven points or fewer, now standing at eleven.

Question: By how many points did the Vikings lose?

Answer:
3