The analysis of reactions $\pi N\to two mesons + N$ within reggeon   exchanges. 2. Basic formulas for fit
  We present technical aspects of the fitting procedure given in the paper V.V. Anisovich and A.V. Sarantsev {\it The analysis of reactions $\pi N\to two mesons + N$ within reggeon exchanges. 1. Fit and results.} (arxiv:0806.1601v1) 
V.V. Anisovich and A.V. Sarantsev