Question regarding how to input material properties parameters when density is missing (Ogden law42)

Hello,

I'm doing a simulation with a verification model for ogden material with cylic displacement controlled loading, and I don't have information regarding the mass or density of the material. All I have are the below information in the table. I want to know what value of density should I input and how to input the relaxation times (and in which parameters of law42 does it correspond to) given in Figure 3 so that I get the results in figure 4. 

The reference is: Holzapfel, G.A.: On large strain viscoelasticity: continuum formulation and finite element applications to elastomeric structures. International Journal for Numerical Methods in En... Article  in  International Journal for Numerical Methods in Engineering · November 1996 DOI: 10.1002/(SICI)1097-0207(19961130)39:22<3903::AID-NME34>3.0.CO;2-C

I also want to reproduce the hertz contact simulation on this site: https://github.com/KratosMultiphysics/Examples/blob/master/contact_structural_mechanics/validation/hertz/README.md

I have the same problem of not having the density values here and I don't know which material law to use in this case.

Please help me out in resolving the issues I'm facing.

Looking forward to your response.

Thanks a lot for taking the time and your support.

Best regards,

Goutham.