How to get standard deviation of time dependent temperature distribution

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Hello. I have trouble extracting standard deviation from temperature distribution.

The load is heated by microwave heating for 60 seconds. I want to get standard deviation of the temperature of the load surface at specific time which is t=60s.

I made aveop2 at 'Definition node' by selecting boundary of the load (surface). And then I used global evaluation in 'Derived Values' and made expression stddev('comp1.aveop2',T) But it makes error.

Could you help me extracting standard deviation? I already saw the post below but still I don't know how to deal with this problem. I really appreciate any advice. https://www.comsol.com/blogs/getting-the-stats-computing-standard-deviations-and-other-statistical-quantities



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