some questions about formulation 10 in paper

[neil-yc]

Hi，thanks for your great works, and i have some questions about the formulation 10

• it says "in the last transition we introduced the explicit simplifying assumption ... which becomes an equality when /sigma2 --> 1";
  infact, i find that the final value of /sigma （task variance param）is not closed to 1, so is the assumption appropriate ?

thanks for your reply