(a) PESQ improvement achieved by OVR systems trained with different personalization strategies in data augmentation (DA) and fine-tuning (FT) and (b) individual difference in PESQ improvement between the conditions generic DA, generic FT and generic DA, personalized FT. Individual data points denote the average over individual target talker test sets. The data points labeled with 0 and 6 correspond to the talkers selected for the listening experiment as the low predicted benefit and high predicted benefit, respectively.