These bases are essentially perpendicular with respect to the common axis. So, once again, if this is the common axis, then these bases are essentially like so if this is the common axis, the bases are at a 90 degree angle with respect to this common axis. And this allows for the stacking of the bases on top of one another. And we'll see why that's important in just a moment. Now, if we examine any one of these base pairs, so let's say this base pair and this base pair, the distance between any two base pairs is given to be 3.4 angstromes, or equivalently 0.3 nm. Now, what they were also able to show is that in a single turn of a DNA molecule, there is a distance of 34 angstromes.