may be entered manually based on empirically discovered formulas for paper or may be selected from a pre existing library of formulas at process block 64 the distribution 56 from the online pulp fiber analyzer 31 monitoring the recycled pulp source 14 is read and at succeeding process block 68 amounts of augmenting pulp from pulp sources 12 and 16 are calculated based on current measurements of those pulps taken at process block 70 using online pulp fiber analyzers 30 and 32 the positioning of the pulp fiber analyzer 31 may be upstream of the metering devices 20 22 and 24 and of the introduction of the pulp into the mixing cabinet 26 to provide for sufficient calculation time to control metering devices 20 22 and 24 for the right augmenting fiber addition the calculation of the necessary amounts of augmenting pulp from pulp sources 12 and 16 may be done by characterizing each of the distributions by one or more moments and using an algebraic decomposition for example as described in ring gerard j f bacon aric j u201c multiple component analysis of fiber length distributions u201d tappi journal vol 78 no 7 pp 224 231 1997 particularly when multiple augmenting fiber sources are used other calculation techniques may also be used for example those employing hill climbing techniques or monte carlo or simulated annealing techniques the predicted distribution of the mixed fibers will be a bin by bin summing of the.