While determining the residue in the differential equations -res for the node_dof records, the contribution for each primary unknown equation can be multiplied with a separate factor. Here factor_0 is the factor for the first primary unknown, factor_1 is the factor for the second primary unknown, etc. A factor should be specified for each primary unknown.
With these factors you can put special importance on the equation for one (or several) primary unknowns. If this record is not specified, all factors are taken to be 1.