There is an entry for each fit parameter. The name for each parameter follows the form:

(Function Name)(Index)(Variable Name)

where "Function Name" is the name of the function within which the variable is embedded, "Index" indicates which function this is within the metafunction, and "Variable Name" is the name of the variable "within" the function. For example,

Poly(2)Cub

would refer to the cubic parameter within a polynomial function, which is the second function in the list.