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Goal: Learn about the mysterious "third argument" in data ingestion in CDAT.

In the standard data ingest command :

 s=f(‘var’,time=(t1,t2))

there is a third, implied argument,  defaulted to ‘ccn’.  

The first 2 letters represents the bounds of the retrieved segment they can be
“c” or “o” as in “Closed” or “Opened”:
The third letter represents the search method, it can be
‘b’, ’n’, ‘e’ or ‘s’ as in ‘Bounds’,’Node’, ‘Extranode’ or ‘Select’
i.e the cell will be considered valid if the bounds or node are
within the interval defined


In the example below:
        (v1,v2,’ccb’) selects
        (v1,v2,’ccn’) does not select
‘e’: same as n but add an extra node
‘s’: select axis elements for which the cell boundary is a subset of the interval

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