Create multiple graphs of the same rrd?

Installing and Using OpenWrt
17

There's two approaches I can think of right now; one is declaring an rrdopts = { ... } array to pass raw arguments directly to rrdtool, the other is using transform_rpn on the datasource and number_format on the graph to calculate the value, like that:

local energy = {
  -- draw this diagram for each plugin instance
  per_instance = true,
  title = "%H: Energy Production and Consumption--%di",
  vlabel = "watts",
  number_format = "%6.2lfkWh",

  -- diagram data description
  data = {
    -- special options for single data lines
    options = {
      power_grid_value = {
        title = "Grid power",
        color = "00ff00", -- green
        transform_rpn = "1,/,24,*"
      },
      power_wind_value = {
        title = "Wind power",
        color = "0000ff", -- blue
        transform_rpn = "1,/,24,*"
      }
    }
  }
}

But thats all from memory, I'd need to play around for myself a little bit to see how it could be best solved. Could you provide me with your *.rrd file by any chance?