[ncl-talk] do loop problem for overlay plot

[Ying Song]

Hi NCL help,

I have a question about overlay plot with do loop. I have two loops (time
and level).  The plot is okay for first loop(time) but the second loop
(level) misses one layer (color filled contour plot) when overlaying. This
is actually the base layer. But the vector and epv are still plotted. No
sure what's wrong in my script. Please help me check. Thank you very much!
Script and plot are attached.
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