[yt-users] How to access fields from a previous level?

[Reju Sam John]

Dear all,
I am analyzing a particular level  "RD0040/RedshiftOutput0040". If I want
to load a field from previous level ie. from "RD0039/RedshiftOutput0039",
what is the method?

I want to calculate    data["Temperature"] / data["Temperature"], where
first one is from RD0040/RedshiftOutput0040" and second one is from
"RD0039/RedshiftOutput0039".

Please suggest a method.

-- 
Reju Sam John
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