Top: expected number of detectable exoplanets (with radii < 6 R_Earth) as a function of the faint source detection limit F_lim for the 10 μm filter. The five curves represent various nulling baselines, i.e., various IWAs ranging from 5.0 mas (baseline value) to 20.6 mas. The red vertical line indicates our baseline detection limit of F_{lim, F1000W} = 0.54 μJy. Bottom: ratios of the other curves to the 5.0 mas curve as a function of the faint source detection limit F_lim.