code: def render_density(
      self,
      ax: Axes,
      data,
      color,
      name,
      *,
      levels=5,
      line_width=1,
      alpha=0.6,
  ):
      ln = ax.plot(
          data[:, 0],
          data[:, 5],
          lw=line_width,
          color=color,
          alpha=1,
          label=name,
      )
  
      for i in range(1, levels):
          ax.fill_between(
              data[:, 0],
              data[:, 5 - i],
              data[:, 5 + i],
              color=color,
              lw=0,
              alpha=alpha**i,
          )
  
      return ln
  
label_desc: Use image node_id 1 for calling the MatPlotLibAnalytics obj's underlying member method code with example usage: obj.render_density(ax, data, color, name) and returns: ln