Bravo Francesco!
Excellent search tool.
Simple, easy-to-use, super-powerful and effective. I highly recommend it.
P.S.: The visualization is helpful though it could be made more legible and effective without recurring to a map. It's fancy but it's not functional for this specific use. A stack of the variables set would be much easier to consult and make sense of.
*I have just published a short review about it on tools.robingood.com.
