def lloyd_only_rref_p(et, p):
    """
    If E0 is know in Lloyd & Taylor (1994) then one can calc
    the exponential term outside the routine and the fitting
    becomes linear. One could also use functions.line0.

    Parameters
    ----------
    et : float or array_like of floats
        exp-term in Lloyd & Taylor
    p : iterable of floats
        `p[0]` is respiration at Tref=10 degC [umol(C) m-2 s-1]

    Returns
    -------
    float
        Respiration [umol(C) m-2 s-1]
    """
    return p[0]*et