﹩68.3 \% ﹩ and ﹩95.5 \% ﹩ credible regions of ﹩{\sigma }_{8}﹩ with the perturbative GDM parameters c_s² (left) and ﹩{c}_{\mathrm{vis}}^{2}﹩ (right) for the Λ-GDM model using the PPS+Lens data set combination. The strong negative correlation in these two pairs of parameters is due to the strong reduction in structure growth induced by the GDM parameters.