Revert "Remove $NTA"

This reverts commit 467391414788a7255f85bdbfae913f3b0df2fd04. (reverted from commit ccaae626941c3b2a89bcda5e790f5a90c1d9a499)
Merge pull request #144 from DavidRagazzi/remove-nta

Revert "Remove $NTA"