For the w₀w_aCDM model, comparison of each of the Fisher marginalised (light grey) and unmarginalised (dark grey) errors on each cosmological and nuisance parameter for: photometric optimistic probe (top left); photometric pessimistic probe (top right); spectroscopic optimistic probe (bottom left); and spectroscopic pessimistic probe (bottom right). For the spectroscopic probe the labels lbs_i are short for the parameters ln(b σ₈)_i.