If a paladin becomes Large, at what point does the paladin’s aura originate?

If you enlarge a paladin (so that they take up 2×2 squares on a grid), what point does their aura’s radius start at?

For Medium/Small creatures (who take up a 1×1 square on a grid), it radiates from one of the corners of the square. For Large creatures, is it still at one of the corners of the 2×2 square, at the intersection at the center of one of the sides of the creature’s space, or at the intersection at the center of the creature’s space?

Additional info:

  • According to the designers, the point of origin of a spherical area of effect is at the intersection of squares on a grid.
  • According to Mike Mearls, paladin auras work the same way.