Fig. 7

Distribution of \(\chi ^2\) to the variations of d and \(\eta\) in the incompressible case. The red area in panel (a) corresponds to the area shown in panel (b). In the panel b, the red cross indicates the position, where the \(\chi ^2\) value reaches a minimum, and the red line indicates the 68.27 % confidence level of \((\eta , d)\)