Hoping to rebound from their home loss to the Browns, the Saints stayed home for a Week 8 interconference duel with the Pittsburgh Steelers on Sunday night.  After a scoreless first quarter, New Orleans trailed in the second quarter as Steelers kicker Jeff Reed got a 19-yard field goal.  The Saints would answer with a 31-yard field goal from kicker Garrett Hartley. New Orleans took the lead in the third quarter as Hartley booted a 23-yard field goal.  In the fourth quarter, the Saints increased their lead as quarterback Drew Brees found wide receiver Marques Colston on a 16-yard touchdown pass.  Pittsburgh responded with running back Rashard Mendenhall getting a 38-yard touchdown run, yet New Orleans came right back as Brees connected with wide receiver Lance Moore on an 8-yard touchdown pass.

Answer this question based on the article: How many more yards was Garrett Hartley's first field goal over his second?
8