The results given in table 14 show that tuning on a pooled set of 6,000 text sections yields only minimal differences to tuning on 2,000 sentence pairs such that the BLEU scores for the new pooled models are still significantly lower than the best results in table 12 (indicated by "<").
increasing the tuning set to 16,000 sentence pairs for IPC sections makes the pooled baseline perform as well as the best results in table 13, except for two cases (indicated by "<") (see table 15).