[atlas] sometimes no RTT?

Hi all! I'm new to RIPE Atlas, and right now using it for educational purposes :)) lately I've seen that some of my traceroute measurements do not have RTT. although it's not completely ignored by the hop (I get the data like from, size, ttl), but only rtt is missing :)) any idea how, why and when does this happen? :) for a live example, check Measurement #4458653. 48th probe's 11th hop's 1st query (counting from zero, btw) does not have rtt :) thanks in advance! side question: is there an (un)official IRC channel? :) -- Antranig Vartanian | PGP Key ID : 0xDAB81456 https://antranigv.am | https://cert.am (* do one thing and do it well *)