st: How do I obtain the Prob > F from the scalars?

[Scott Talkington <talkings@gmu.edu>]

I wanted to output the N, F stastistic, and the Prob > F (significance) 
to an Excel sheet in a workbook and was using tab_xml to do it 
(appending a sheet to an already existing workbook).  But the latter 
value doesn't seem to be among the scalars available.  Is there a way I 
can calculate it from the variables that  are available after an estimation?
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