Generic subtractor: generic subtractor using (JetMedianBackgroundEstimator, using Longitudinally invariant kt algorithm with R = 0.4 and E scheme recombination with Active area (explicit ghosts) with ghosts of area 0.00997331 (had requested 0.01), placed according to selector (|rap| <= 4), scattered wrt to perfect grid by (rel) 1, mean_ghost_pt = 1e-100, rel pt_scatter = 0.1, n repetitions of ghost distributions = 1 and selecting jets with |rap| <= 3) to estimate the background