It is also worth mentioning that phantom tokens, i.e., empty tokens inserted for the analysis of certain elliptical constructions (see section 2), have a labeled precision of 82.4 and a labeled recall of 82.8 (89.2 and 89.6 unlabeled), which is very close to the average accuracy, despite being very infrequent.
it must be remembered that these tokens were given as part of the input in these experiments.