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  28  <H2><A NAME="7_10">7.10 Handling date/time scales</A></H2>
  29  <P> With date/time scale we refer to the plotting of data where the
  30   independent variable (X-axis) de-nominates a time value. This could for
  31   example be the temperature measured in intervals during a day.</P>
  32  <P> From version 1.18 and onwards there are two principal ways of
  33   handling date/time scales. The manual way and fully automatic using the
  34   special &quot;dat&quot; scale. For most cases the automatic &quot;dat&quot; scale is the
  35   preferred choice but in rare circumstances it might be more appropriate
  36   to use the manual way since it gives slightly more control (but not
  37   that much) of the overall handling of scales.</P>
  38  <P> To be able to use a date/time scale at all we will assume that the
  39   data points are represented by both an X coordinate (time-value) and a
  40   Y-value (anything else wouldn't make sense).</P>
  41  <P> We first start by describing the use of the &quot;dat&quot; scale.</P>
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