def get_control_latex(model):
    """
    Get the labels for each Hamiltonian.
    It is used in the method method :meth:`.Processor.plot_pulses`.
    It is a 2-d nested list, in the plot,
    a different color will be used for each sublist.
    """
    num_qubits = model.num_qubits
    num_coupling = model._get_num_coupling()
    return [
        {f"sx{m}": r"$\sigma_x^{}$".format(m) for m in range(num_qubits)},
        {f"sz{m}": r"$\sigma_z^{}$".format(m) for m in range(num_qubits)},
        {
            f"g{m}": r"$g_{}$".format(m) for m in range(num_coupling)
        },
    ]