Looking on the Apple website (compare iPhone models), it shows the iPhone 6 Plus as having a retina screen with a 1920 x 1080-pixel resolution at 401 ppi.
The presets shown in Indigo 6 are:
- iPhone 6 Plus Portrait
414 x 672 - iPhone 6 Plus Portrait (Retina)
1242 x 2016 - iPhone 6 Plus Landscape
736 x 370 - iPhone 6 Plus Landscape (Retina)
2280 x 110
As an aside (this may have been mentioned before?); it would be useful if once you had made a preset selection, the Control Page showed you what preset name you had selected.