sometimes the exp. column can be too large

def format_exp_floats(decimals):
    """
    sometimes the exp. column can be too large
    """
    threshold = 10 ** 5
    return (
        lambda n: "{:.{prec}e}".format(n, prec=decimals) if n > threshold else "{:4.{prec}f}".format(n, prec=decimals)
    )