The probabilities p0,p1,p2,... of a discrete distribution of a variable with possible values 0,1,2,... can also be given by a FIT specification of an alternative form FIT=MATRIX(<name_of_matrix_file>) ( for example, FIT=MATRIX(P5) ) In this case the probabilities p0,p1,p2,... must be saved as the first column of the matrix file. If these probabilities have been computed by using some estimates of parameters (computed from the current data), the number of such parameters should be given by a PARAM specification. H = More information on HISTO