After snapping a six-game losing streak the previous week, the Seahawks went home for a Week 16 interconference duel with the New York Jets, in what would be Mike Holmgren's last home game as the franchise's head coach. Seattle would trail in the first quarter as Jets kicker Jay Feely got a 20-yard field goal.  The Seahawks would respond with quarterback Seneca Wallace completing a 2-yard touchdown pass to rookie tight end John Carlson. In the second half, Seattle pulled away with kicker Olindo Mare's 31-yard field goal in the third quarter and a 38-yard field goal in the fourth quarter, while the defense would shut down New York's offense. With the upset win, the Seahawks improved to 4-11.  This was the only time during the season that the Seahawks won back-to-back games as well as their only win over a team with a winning record.  This was also known as the "snow ball" game.

Based on the above article, answer a question. How many yards longer was Mare's longest field goal kick than his shortest?
7