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My understanding is no. Netflow is basically an add-on piece to NPM. It doesn't maintain its own database or really its own nodes. ie, you need to be monitoring the nodes in NPM in order to receive netflow traffic from them.
netlogix, apscherz is correct; NTA cannot run independently of NPM. NTA is considered an NPM module and therefore requires NPM for node management, etc.and also uses the NPM database.
Depending on how you wanted to limit NPM and NTA users from accessing the features of each application, you could possibly setup effective account limitations. In any case, though, the data would all be stored in the same database.
That's what I figured, but I figure I ought to ask just in case.