Fraction of response that is described by an error function (α).

Table represents the variation of α with both pressure and distance traveled for interface. Data of α was listed as mean ± SD (n = 4) and were statistically analyzed by two-way ANOVA. The interaction between two factors were significant (P < 0.0001) and F = 25.07. The comparisons were made using Bonferroni post-test against the 1 mm column values with a significance level of P < 0.05 (*) and P < 0.001 (***). Fraction of response that is described by an error function (α).