This section contains information specific to the way theoretical predictions are stored in the NNPDF system. First, theoretical background is given on the FK table format, which is the file format used to store theoretical predictions. Next, the parameters used to define a set of FK tables, otherwise known as a theory, are given. A table showing the correspondence between the available theories and these parameters is then given in the next section. Finally, a way to access this information using the NNPDF code itself is detailed.