 " I have studied [ the paper ] in detail and do not agree with his conclusions , " Steven Vogt said in reply , concerned that Gregory has considered the HIRES data as more uncertain . " The question of Gliese 581g 's existence won 't be settled definitively until researchers gather more high @-@ precision radial velocity data " , Vogt said . However Vogt expects further analysis to strengthen the case for the planet . 
