Dear all, I am reading the paper "Cosmic dynamics in the era of Extremely Large Telescopes " by Liske et al. about redshift. I get the physical meaning of redshift drift, but when it comes to the error bars, I am confused. - Aren't the error bars given in equation (15) ? - Isn't this function plotted in figure 7 with S/N=13000 and N=10 ? (the red solid line??) - If so, then why am I getting something different while plotting it? Is there something I am missing?