Integrated spectrum extracted from the R100 cube using the G2 mask of Fig. 1, with illustrative 1σ errors shown as shaded region. A basic fit to the data is shown by the green line. The lower panel shows the residual, with the centroids of each line depicted by dashed lines. From left to right, the lines are Hβ, [OIII]λλ4959, 5007, [NII]λ6548, Hα, and [NII]λ6584. The best-fit redshift is z_G2 = 2.00 ± 0.01.