Table 1.

Changes in objective function for each parameter varied by $\pm$10% from original values, defined as $\mathit{\Delta }O=(O^{+}+O^{-})/2$; $O^{+}$ is the change from a $+$10% increase in one parameter, and $O^{-}$ is the change from a $-$10% decrease in one parameter

	$a$ (kPa)	$b$	$a_{\text{f}}$ (kPa)	$b_{\text{f}}$	$a_{\text{s}}$ (kPa)	$b_{\text{s}}$	$a_{\text{fs}}$ (kPa)	$b_{\text{fs}}$
$\mathit{\Delta }{f}_{\mathrm{obj}}$	0.006	0.004	0.014	0.0008	0.0004	0.0004	0.003	0.0008
$\mathit{\Delta }{f}_{\mathrm{vol}}$	$8.7\times {10}^{-6}$	$6.9\times {10}^{-6}$	0.0009	$2.1\times {10}^{-5}$	$3.6\times {10}^{-7}$	$3.6\times {10}^{-7}$	$2.2\times {10}^{-6}$	$7.1\times {10}^{-7}$
$\mathit{\Delta }{f}_{\mathit{\epsilon }}$	0.006	0.004	0.013	0.0007	0.0004	0.0004	0.003	0.0008