Biases between DONJON simulations using different sampling for MCPOs, on plutonium isotope inventories at reactor discharges. Biases are displayed, for each isotope, over the absolute value of the relative distance between loaded and reference isotopic value, for this same isotope. Biases are displayed for perturbative MCPO (in orange) and for recombined perturbative MCPO (in green), relative to a full MCPO with regular grid sampling.