 Two weeks after the announcement of the discovery of Gliese 581 g , astronomer Francesco Pepe of the Geneva Observatory reported that in a new analysis of 179 measurements taken by the HARPS spectrograph over 6 @.@ 5 years , neither planet g nor planet f was detectable . Vogt responded to the latest concerns by saying , " I am not overly surprised by this as these are very weak signals , and adding 60 points onto 119 does not necessarily translate to big gains in sensitivity . " More recently , Vogt added , " I feel confident that we have accurately and honestly reported our uncertainties and done a thorough and responsible job extracting what information this data set has to offer . I feel confident that anyone independently analyzing this data set will come to the same conclusions . " 
