Fig. 2. Regressions of rates of appearance (R_a) of glycerol (A) and NEFA (B), expressed per unit of fat mass (FM) on plasma concentration. Each symbol represents an individual observation. Closed circles, phase II; open triangles, phase III. Differences in regression slopes for the two fasting phases were tested with an analysis of covariance (ANCOVA), using the glycerol or NEFA concentration x phase of fasting interaction as factor. Differences in intercept were tested for with an ANCOVA, with the fasting phase as factor.