def _print_sir_params(fig_params):
    """
    Function to print parameters of plotted visualisation of SIR diffusion.

    :param fig_params: list with 4 elements (printable) - name of graph, beta coefficient, gamma coefficient and
     fraction of ill nodes on start.

    :return: formatted string which is a subtitle of gif.
    """
    return 'Graph - {}, $\\beta$ - {}, $\\gamma$ - {}, $I/N$ - {}'.format(
        fig_params[0], fig_params[1], fig_params[2], fig_params[3])
