                 .classed variable: true
                 .text " I(λ,T)"
 
-          plotSvg.append "g"
+          svg.append "g"
             .classed label: true, x: true
             .append "text"
             .attr "text-anchor": "middle", dy: ".71em", y: -10


        api.update()

      plotSvg = selection.selectAll ".plot.planck"
        .data [1]
        .call (plotSvg) ->
          plotSvg = plotSvg.enter()
            .append "svg"
            .classed plot: true

          plotSvg.append "defs"
            .append "clipPath"
              .classed "planck-path": true
              .attr id: "planckPath"
              .append "rect"

          plotSvg.append "g"
            .classed plots: true
            .attr "clip-path": "url(#planckPath)"
            .call (plots) ->

                .text " λ"


          svg.append "g"
            .classed wavelength: true, interactive: true
            .attr "text-anchor": "middle"
            .append "text"

      # harvest selectors just initialized
      plots = svg.select ".plots"
      solutions = plots.select ".solutions"
      plotsBg = plots.select ".bg"
      defs = svg.select "defs"
      clip = defs.select ".planck-path rect"
      el_xAxis = svg.select ".axis.x"
      el_yAxis = svg.select ".axis.y"
      yLabel = svg.select ".label.y text"
      xLabel = svg.select ".label.x text"
      wavelengthLabel = svg.select ".wavelength.interactive"
      wienSeries = plots.select ".wien"


