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Figure 4: The form of the coupling parameter $g(\varphi )$ has been plotted against $\varphi$ (with $f=0.5,h=0.68,t_0=13\text{Gyr}\mathrm{,}\hspace{0.17em}{\Omega }_{mo}=0.3$). It remains almost flat at the later epoch of cosmic evolution, ensuring late time acceleration.