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  28  <H3><A NAME="7_19_4">7.19.4 Formatting the scale labels</A></H3>
  29  <P> In order to have full control over the way that the labels are
  30   displayed it is possible to define a callback function that will be
  31   applied to all labels. The callback function will be called with the
  32   label as the only argument and should return the value that will be
  33   displayed in the graph. This could for example be used to turn seconds
  34   (used to position data points) into hour and minutes on the scale. For
  35   further reference see the two methods: <A href="../ref/Axis.html#_AXIS_SETLABELFORMATCALLBACK">
  36   Graph::SetLabelFormatCallback();</A> and <A href="../ref/Axis.html#_AXIS_SETLABELFORMAT">
  37   Graph::SetLabelFormat();</A></P>
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