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automating subjective criteria: log graph with background noise

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This is a bit obscure, but I have a challenge for you.  I'm tasked with automating a step in a test, which currently is being done visually by the operator.  It involves a count-rate plot on a graph control (a spectrum plot).  The single criterion is to be sure that the cutoff occurs at 50.00 on the X-axis.

 

2016-09-14 15_18_16-Data Graphs.png

 

This is a bit tricky to isolate, due to the amount of noise after this spot on the axis.  I tried looking at a polynomial trend line, but this isn't very helpful. 

 

2016-09-15 08_31_49-Data Graphs.png

 

Thoughts?


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