We demonstrate that the latest constraints on inflationary observables,
    namely the tensor-to-scalar ratio $r$ and the scalar spectral index $n_{_S}$,
    from the Cosmic Background Radiation (CMB) observations are already strong
    enough to rule out the model of a scalar field with a power law potential even
    in the presence of kinetic coupling to gravity with a positive coupling
    constant. The case for a negative coupling constant needs special treatment.

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