Various uncertainties in Log (Φ) as a function of stellar mass for different redshift bins from z = 4 to z = 7. Blue curves (SFH) indicate the uncertainties due to the different SFHs adopted in this work. Green curves (MCsim) are related to the Monte Carlo simulations described in paragraph 4.1. The red lines (Z_phot) indicate the error introduced by different photometric-redshift solutions. Finally, the dark-green lines (CVar) indicate the error due to cosmic variance.