The ratio of the SPT 1-loop monopole (blue solid), quadrupole (orange dashed) and hexadecapole (green dotted) between different codes for ΛCDM (left) and DGP (right) at z = 0.5 without infrared-resummation applied. The MG-Copter prediction is taken as the reference in all plots. The top left shows the prediction by Atsushi Taruya’s code, the middle left and top right plots show the PBJ predictions and the bottom left and bottom right show the Pybird predictions. Atsushi Taruya’s code and PBJ predictions are computed using the EdS approximation and without screening in the DGP case. We also adopt these approximations in their respective reference spectra from MG-Copter. Pybird predictions are exact and so are the respective MG-Copter reference spectra. The DGP parameter is set to Ω_rc = 0.25. Blue and beige bands indicate errors on the monopole and quadrupole assuming a ΛCDM Gaussian covariance with V = 3.8 h⁻³ Gpc³ and no shot noise contribution. We note that the hexadecapole error fills the plot and so we have omitted it.