Hi, Dr. Cox and Dr. Treeby,

I am confused about what's the meaning of c_0 in the equation of state in lossy media, which is:

p(r,t) = c_0(r)^2 * rho(r,t) + absp_term + disp_term

In lossy media, the sound speed depends on the frequency. In this case, what's the frequency does c_0 correspond to?

Thank you very much!

Best,

Chao