Distribution of the comoving separations d between the GRBs in the Greiner sample (including the Swift subsample of 244 GRBs and most of the SHOALS GRBs). The x-axis is the comoving separation of the GRB data, in units of h^-1 Gpc. The y-axis is the proportion of the GRB number in each bin to the whole sample, which has been normalized to 1. The separation d obeys a Gaussian distribution with the expectation value Mpc.