<mugl>
  <horizontalaxis type="datetime" >
    <labels format="%d %n %H:00" spacing="1D 12H 6H 4H 2H 1H" />
    <title/>
  </horizontalaxis>
  <verticalaxis type="number" min="15.0" max="22.0">
    <title angle="90">temp</title>
  </verticalaxis>
 <plot>
    <verticalaxis><variable ref="airtemp"/></verticalaxis>
    <renderer type="line">
      <option name="linecolor" value="blue"/>
      <option name="dotcolor"  value="blue"/>
      <option name="dotsize"   value="2"/>
    </renderer>
 </plot>
 <plot>
    <verticalaxis><variable ref="surtemp"/></verticalaxis>
    <renderer type="line">
      <option name="linecolor" value="red"/>
      <option name="dotcolor"  value="red"/>
      <option name="dotsize"   value="2"/>
    </renderer>
 </plot>
 <data>
    <variables>
      <variable id="time" type="datetime"/>
      <variable id="airtemp"/>
      <variable id="surtemp"/>
    </variables>
    <values>
200905280000,20.0,20.99
200905280100,19.0,19.96
200905280200,18.9,18.30
200905280300,18.5,17.25
200905280400,18.2,16.76
200905280500,17.9,16.70
200905280600,17.5,16.93
200905280700,17.5,16.34
200905280800,17.7,16.77
200905280900,17.8,17.19
200905281000,17.6,17.33
200905281100,17.5,17.38
200905281200,17.7,18.17
    </values>
 </data>
</mugl>