Number density of MPGs with different mean stellar mass density in VIPERS field as a function of the redshift. Dark red triangles refer to high-Σ MPGs, orange circles refer to intermediate-Σ MPGs, and green squares to low-Σ MPGs. Black circles show the number density for the total sample of MPGs. Number densities for the three sub-populations are shifted in redshift to better visualize them. The error bars correspond to 1σ. We fitted the data with a power law and solid lines are the best-fit relations.