After their Thanksgiving win, the Lions traveled south to play the New Orleans Saints. The Lions opened the scoring in the first quarter via a 27-yard field goal from Matt Prater. Detroit extended their lead in the second quarter via a one-yard touchdown pass from Matthew Stafford to Theo Riddick. The Saints reduced the Lions lead to seven points via a 40-yard field goal from Wil Lutz. The two teams exchanged field goals, one from Prater from 29 yards, and one from Lutz from 32 yards, making the score 13-6 in favor of the Lions at halftime. The Lions added two field goals from Prater in the third quarter, from 32 yards and 27 yards out, extending their lead to 19-6. The Saints opened the scoring in the fourth quarter with a one-yard touchdown run from John Kuhn. The Lions responded on the next drive with a 66-yard touchdown pass from Stafford to Golden Tate, which was followed by a failed two-point conversion. Matt Prater finished the scoring with a 52-yard field goal, giving the Lions a 28-13 win. This marked the first game all year in which the Lions never trailed in the fourth quarter, and their first game of 2016 to be decided by more than seven points. The Lions defense held Saints quarterback Drew Brees without a touchdown pass, ending a streak of 60 straight home games in which Brees threw for at least one touchdown. Further, the Lions won a road game following their Thanksgiving Day game for the first time since 1974, ending a streak of 22 losses in such games. In one stretch during the first half, Matthew Stafford completed 14 consecutive passes, a Lions franchise record.

Answer this question based on the article: How many points were the Lions winning by at halftime?
7