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Fig. 5. Logistic regressions of RAPD marker band AG14.0825 frequencies (Pij) as a function of cycle and direction of selection for neutral detergent fiber (NDF) concentration in four smooth bromegrass populations. The common-slope logistic regression equation was LN[Pij/(1 – Pij)] = 1.8603 – 0.4487di1 – 1.0557di2 – 0.6267di3 + 0.4620i, where dij = 0 (absence) or 1 (presence) for each population; j = 1 for Alpha, 2 for WB19e, or 3 for Lincoln; and i = cycle number.