Large-scale structure observables for the different MG models evaluated at the fiducial values of the model parameters used for the Fisher matrix analysis. Top left: linear (dashed) and non-linear (solid lines) matter power spectrum P_δδ(z, k) entering Eqs. (36) and (30), respectively, evaluated at redshift ζ = 0, for KM1 (ϵ_2,0 = –0.04, blue), JBD1 (ω_BD = 800, red) and nDGPl (Ω_rc = 0.25, green). Top right: ratio of the matter power spectra for the above mentioned models with respect to their ΛCDM counterpart with the same value of σ₈ today, for the linear (dashed) and non-linear (solid) cases. Bottom left: cosmic shear (WL) angular power spectra for the auto-correlation of the first photometric bin $C_{1,1}^{\text{WL}}(\ell )$ (solid line) and the cross-correlation of the first and last bin $C_{1,10}^{\text{WL}}(\ell )$ (dotted line), defined in Eq. (30) for the three models considered above, with the same colour labelling. Bottom right: ratio of the cosmic shear C_i,j(ℓ) to their ΛCDM counterpart, for the bin combination i = j = 1 and i = 1; j = 10.