Comparison of spectral measurements between the low-dispersion prism and medium-dispersion gratings. Upper: comparison of redshift as determined from Prism/Clear and R ≈ 1000 grating observations for targets with emission lines clearly detected in both modes. There is a systematic offset of Δz = 0.0039, with the prism yielding systematically higher redshifts. Lower: comparison of emission lines fluxes measured from prism and R ≈ 1000 grating. Measurements derived from the grating are systematically higher with a median value of f_R≈1000/f_prism = 1.105 and a standard deviation of 0.298.