That's an impossible question to answer without more info - probably seeing the testcase would make it easier (so customer support would be the right avenue). My first impression is that your measurement has only discrete levels - the measurement on the left has values which are exactly 161, 164 or 167. The measurement on the right has values which are only 138 and 141. These look remarkably exact and you can see all the vertical circles are exactly in line (these are the individual results from each measurement). So I wouldn't ever expect a gaussian response when you have a small number of discrete outputs which are possible (it might be Poisson depending on the test, but even that doesn't sound right in this case). So what is your measurement computing? Regards, Andrew.
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