Cfchart: 2 series, different series length

Question

I am plotting two lines on a cfchart:  1) a line with historical monthly averages (12 data points); 2) the actual data for the current year (which only has as many data points as there are "completed" months in the current year).
What I want to have happen is for all 12 months of (1) to be plotted as one line and then have a second line drawn that only shws the months of the current year for which data has ben collected (say the first three months).  For the remaining periods of the second line(e.g., 9 months) I want to show nothing (no line).  In other words the second line just stops after the first 3 data points are drawn.  Both series are arrays.
Here's what I've tried:
When the second array contains only 3 data points (i.e., arraylen = 3), cfchart draws the 4th through 12th data point as 0 and draws the line accordingly even though I am using chartdata within a loop that only loops 3 times.  If I create an empty array of 12 items (i.e. each item is empty) and then insert data for the first three, cfchart throws an error because item 4 through 12 are not values.
BTW I am using a custom xml style sheet that has "isInterpolated" set to "false".
Any suggestions as to how I might get the chart drawn correctly?

Answer 1

Weird. I tend to use variables. So I was about to say I could be wrong about the path. Maybe a url is expected. But it looks like you tried that already.
Try these two examples. Both work fine for me with CF9 (and CF8). Everything except isInterpolated was excluded for brevity. So obviously most of the styling will be missing. But the lines should be correct.
1. Use a variable
<cfsavecontent variable="myStyle"><?xml version="1.0" encoding="UTF-8"?>
<frameChart autoAdjust="false" is3D="false" isInterpolated="false">
</frameChart>
</cfsavecontent>
<cfchart style="#myStyle#">
     <cfchartseries type="line">
         <cfloop from="1" to="12" index="x">
             <cfchartdata item="#MonthAsString(x)#" value="#randRange(1, 100)#">
         </cfloop>
     </cfchartseries>
     <cfchartseries type="line">
         <cfloop from="1" to="4" index="x">
             <cfchartdata item="#MonthAsString(x)#" value="#randRange(1, 100)#">
         </cfloop>
     </cfchartseries>
</cfchart>
2.  Save the contents of "myStyle" to a file in the same directory as your .cfm script.
XML File: c:\coldfusion9\wwwrooot\testFolder\myStyle.xml
CFM File:  c:\coldfusion9\wwwrooot\testFolder\myTestChart.cfm
<cfchart style="myStyle.xml">
    <cfchartseries type="line">
        <cfloop from="1" to="12" index="x">
            <cfchartdata item="#MonthAsString(x)#" value="#randRange(1, 100)#">
        </cfloop>
    </cfchartseries>
    <cfchartseries type="line">
        <cfloop from="1" to="4" index="x">
            <cfchartdata item="#MonthAsString(x)#" value="#randRange(1, 100)#">
        </cfloop>
    </cfchartseries>
</cfchart>