Apply Amati relation to constrain the possible redshift range of GRB 101011A and GRB 100704A. The thick (thin) solid lines enclose the 3σ (2σ) regions of the correlation. The upper 3σ line is defined by adopting γ = 1.46 + 0.29, A = 49.17 + 3σ _ext, while the lower 3σ line is defined by adopting γ = 1.46 − 0.29, A = 49.17 − 3σ _ext. The 2σ region is defined similarly. The region between two dashed lines and two dotted lines are the possible positions for GRB 101011A and GRB 100704A on this plot with different redshifts. The requirement that the GRBs enter the 3σ region gives z ⩾ 0.246 for GRB 101011A and z ⩾ 0.166 for GRB 100704A.