def A_int(freqs, delt):
    """Calculates the Intermediate Amplitude

    Parameters
    ----------
    freqs: array
        The frequencies in Natural units (``Mf``, G=c=1) of the waveform
    delt: array
        Coefficient solutions to match the inspiral to the merger-ringdown portion of the waveform

    """
    return (
        delt[0]
        + delt[1] * freqs
        + delt[2] * freqs ** 2
        + delt[3] * freqs ** 3
        + delt[4] * freqs ** 4
    )