How do I mark a "not measurable" event on a chart history?

I have an application which is working very well and takes measurements - continuously plotting a result on a chart. The chart history is typically a 100 or so measurements. I plot on the chart both an upper and lower tolerance limit, hence the measurment plot should hopefully stay between the two (straight lines) limits.
Occasionally a sample is "missing" and when this happens a "measurement" of zero is given. This is currently displayed on the chart as a sudden drop to zero. The users like this as it shows them clearly that the sample was missing. All OK so far, however...
On rare occasions a sample is present and is measured but for reasons I will not go into we know (and the software can determine) that the measurement result is actually invalid. This situation I call "not measurable" in that although a sample is present it actually cannot be properly measured. The question is this; how do I show this on my chart history?The chart history plot is by far the most looked at display of data for the users. I realise that I could show a message box saying "not measurable" (and intend to do so) but this would only last for that measurement cycle. How do I "mark" the chart to show that there was a sample but that it was not measurable.
I don't particularly want to use a zero value because that is being used quite nicely for the "no sample" situation. Also I don't want to simply not plot anything because the fact that the sample was "not measurable" is potentially very important indeed. Ideally what I would like is to put a marker, say a thick vertical line at the position where the invalid measurment is, in order to both block it out to show that it is wrong and also show there actually was a sample there in the first place.
Any ideas as to how I can do this? Sorry this is a bit wordy!
Regards
Kevin

Hi
I have come up with a quick fix for using a chart which might give you a few ideas. This is just a quick fix and isn’t very nice at all. The green dots are meant to represent the immeasurable data, I have just triggered them by a set of limits. You would be better of using an XY plot and an array which you constantly up date. Using an XY graph will give you a lot more options such as using cursors to mark certain points.
I have attached my quick fix and an example of using text on an XY graph
Hope this at least gives you some ideas
Tim
AE NI UK and Ireland
Attachments:
quick fix.vi ‏17 KB
Text_by_Points_on_XY_Graph[1].vi ‏32 KB

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