Investors enjoyed another session of solid gains to start the week thanks to a late rally. The index opened lower and traded in the red most of the day, bottoming at 653 a hour before the close. However, a sharp rally in the last 60 minutes of trading pushed the index higher to close up 5.48 points, or 0.8%, to 663.37. GAS (+3.1%), which jumped on its dividend announcement (see our writeup below), was the biggest contributor to the gains