Figure 4. Filament diameter, d vs. time, for a representative young person. The relaxation time was found by fitting the equation to the almost linear (in the semi-logarithmic frame) sections of the graphs between the vertical lines. At rest: (a) whole saliva, = 1 ms; (b) submandibular/sublingual, = 3.58 ms; (c) parotid, = 1.08 ms. Stimulated saliva: (d) whole saliva, = 3.46 ms; (e) submandibular/sublingual, = 18.70 ms; (f) parotid, = 1.31 ms.