Scaling of the [S ii] density for other temperatures. A comparison of the diagram at T_e = 10   000   K (red) and T_e = 14   000   K (dash-dotted line) is shown. The rescale of the horizontal axis by n_e(10⁴/T_e)^1/2 (dashed line) is not perfect. An additional scale of the vertical axis results in nearly undistinguishable curves (solid black line). (This figure is available in color in electronic form.)