def setup_cbar(fraction=0.046, pad=0.04, kwargs={}):#label=None, ax=None, fs=None):
    """Set up colorbar sizing with some convenient default choices.
    
    Inputs
    ------
    fraction: float, optional, default: 0.046
        Fraction of original axes to use for colorbar. See `plt.colorbar` docs for
        more information.
    pad: float, optional, default: 0.04
        Fraction of original axes between colorbar and new image axes. See
        `plt.colorbar` docs for more information.
    kwargs: dictionary, optional
        Other keyword arguments to pass through to `plt.colorbar`.
        
    Returns
    -------
    
    Example usage
    -------------
    >>> replots.setup_cbar(kwargs={'ax': [ax4,ax5], 'label': 'Celsius'})
    """
    cbar_kwargs = {'fraction': fraction, 'pad': pad}
        
    # prioritize input arguments over defaults.
    cbar_kwargs = {**cbar_kwargs, **kwargs}

    return cbar_kwargs