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  28  <H3><A NAME="7_1_6">7.1.6 Handling null-values in line plots</A></H3>
  29  <P> JpGraph offers two ways of handling null values (or discontinuities)
  30   in the data. You can either have a &quot;whole&quot; in the data or the line may
  31   be extended between the previous and next data point in the graph.</P>
  32  <P> If the data value is null (&quot;&quot;) or the special value &quot;x&quot; then the
  33   data point will not be plotted and will leave a gap in the line.</P>
  34  <P> If the data value is &quot;-&quot; then the line will be drawn between the
  35   previous and next point in the data ignoring the &quot;-&quot; point.</P>
  36  <P> The following example shows both these possibilities.</P>
  37  <P><DIV class="example">
  38  <BR> <A href="exframes/frame_nullvalueex01.html" target="blank"><IMG border="0"
  39  HEIGHT="250"       src="img/img/img/img/img/img/nullvalueex01.png" WIDTH="400"></A>
  40  <BR><B>Figure 15:</B> Handling null values in line graphs <A href="exframes/frame_nullvalueex01.html"
  41  target="blank">[src]</A>&nbsp;
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