code: function(fc, z, breaks, colors, style){
      var vals = _.chain(fc.features)
        .pluck('properties')
        .pluck(z)
        .value()
  
      var normals = normalize(breaks.length)
      fc = colorize(fc, z, colors, breaks, normals)
      fc = setLegend(fc, z, colors, breaks, normals)
      fc = applyStyle(fc, style)
      return fc
    }
docs: CUSTOM