Figure 2.

Results of numerical simulations of equations (4)-(7) with the parameters in Table 1. (a) Times $t_{\upsilon }^{(p)}$ (red circles) and $t_d^{(p)}$ (navy squares) at which the real part of complex order parameters $z_{\upsilon }$ and $z_d$ peak in the core and shell, respectively, and the core-shell difference between peak times $t_{\upsilon }^{(p)}-t_d^{(p)}$ (green diamonds) in the entrained state, as a function of the external light-dark period $T$ . (b) Time dependence of the real part of the order parameter in the core ( $\mathrm{Re(}{z}_{\upsilon }\mathrm{)}$ , red line) and shell ( $\mathrm{Re(}{z}_d\mathrm{)}$ , navy line) for light-dark cycles with period $T=24\mathrm{h}$ . The peak time in the shell precedes the peak time in the core by $2.3\mathrm{h}$ .