The smallest but otherwise best preserved of the two depicted fragents is the one presented as the first in the catalogue. As this is the one with the same orientation as the known to be reversed R1, I call this one the secondary sheet, and the one in the presumably original orientation the primary one. Within this, I append the number two to both, as the third and fourth fragments would make up part one (the upper part) of the respective sheets.
I have only had access to photos of the reproduction of the fragments in the mentioned catalogue; I have therefore attempted to correct for the resulting geometrical distortion, but bear in mind that this might misrepresent the original somewhat. The images above link to higher resolution versions.