7 1/3 is larger than 7, so shouldn't 7 1/3 have a larger NDR? Just to be clear, this is not just a simple case of different methodolgies. The paper LER is the basic method to determine the aim negative density range for a paper. A NDR of 1.25 simply will not fit on a LER 1.05. The only possible explanation as to why the Zone System 1.25 target density range determined from testing is able to print on a grade 2 paper with a LER of 1.05 is because of the addition of flare (which is not factored in with the testing) in normal shooting conditions. Remember in camera Zone System testing has minimum to zero flare.