While I'm sure we all appreciate your tech insights, Iliah,
if you could actually explain what they mean, :? we would be much better able to respond to them. This post, along with most of your others leave me scratching my head wondering *** you're talking about! What does this particular riddle mean to a layman, who knows nothing about charts & graphs? What's R/B ratio?
Dear Steve, Paul explained the graph very well. What you can also see there is that D2X reaches R to B ratio at about 5300, while other cameras do that at lower temperatures. D2X characteristic shows the effort Nikon made to lower the noise by reducing the necessity of digital amplification (multiplication) of raw data.