of and agreed with the experimental data within a

Figure 2. Comparison of the a (upper set) and f3 (lower set) of this work (w = 1.8,urn (0), 3.2,urn (6) and 4.8,urn (V)) with the results of Urquhart et al. (short dashed lines), Ritter et al. (long dashed line) and Buttari et al. (solid line).