function printt(t, prefix, maxdepth)
  prefix = prefix or ''
  maxdepth = maxdepth or 2
  for k, v in pairs(t) do
    if prefix ~= '' then
      k = prefix .. "." .. k
    end
    if type(v) == "table" then
      if maxdepth > 1 then
        print(k .. ":")
        printt(v, k, maxdepth - 1)
      else
        print(k .. ": <table>")
      end
    else
      print(k .. ": " .. tostring(v))
    end
  end
end

color = require("colorbrewer")