[ferret_users] Ocean mask on a panel plot

["Kwesi A. Quagraine" <starskykwesi@xxxxxxxxx>]

Hello Ferreters

I am trying and failing to mask the ocean in my datasets for my panel plots. However, I get this error after the first plot is done, it fails to recognise the data for the second plot; 

let nanom2 = anom[gt=upper[d=4]]

let nx = `upper,return=isize`

 **ERROR: variable unknown or not in data set: UPPER

DEFINE VARIABLE nx = `upper,return=isize`

Command file, command group, or REPEAT execution aborted

However, when I remove the masking of the ocean, the script runs fine and makes the two plots. 

I have about 16 files, but I will simplify with an example to see the problem. I would be grateful for any help on this.

Attached is a snippet of my code and an image of the output plot. 

Thanks for the help in advance

Kwesi

Attachment: test_one.jnl
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Attachment: Screen Shot 2019-03-18 at 19.14.09.png
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