def _decorate_axes(ax, freq, kwargs):
    """Initialize axes for time-series plotting"""
    if not hasattr(ax, '_plot_data'):
        ax._plot_data = []
    ax.freq = freq
    xaxis = ax.get_xaxis()
    xaxis.freq = freq
    if not hasattr(ax, 'legendlabels'):
        ax.legendlabels = [kwargs.get('label', None)]
    else:
        ax.legendlabels.append(kwargs.get('label', None))
    ax.view_interval = None
    ax.date_axis_info = None
