{
  "recording_pairs": 200,
  "target_appearances": 2400,
  "eligible_appearances": 2139,
  "eligible_fraction": 0.89125,
  "loss_fraction": 0.4109396914446003,
  "backgrounds": [
    {
      "background": 0,
      "eligible_appearances": 692,
      "species": 16,
      "loss_fraction": 0.41184971098265893,
      "median_score_change": -0.2429209202528
    },
    {
      "background": 1,
      "eligible_appearances": 722,
      "species": 16,
      "loss_fraction": 0.42105263157894735,
      "median_score_change": -0.24362695217132568
    },
    {
      "background": 2,
      "eligible_appearances": 725,
      "species": 16,
      "loss_fraction": 0.4,
      "median_score_change": -0.24048185348510742
    }
  ],
  "interpretation": "Continuous natural background is identical in the single-source baseline and mixture. The added heterospecific passage still occupies a disjoint time interval. These conditional losses do not estimate error frequency in unmodified field recordings."
}