Table 2:

Abstract multi-document summarization on TAC 2009 with 95% confidence intervals.

System	ROUGE-1	ROUGE-2	ROUGE-L	BLEU-4	Repetition
T5 (ZSL)	29.97 (28.55 – 31.38)	9.03 (7.78 – 10.30)	17.98 (16.89 – 19.21)	3.67 (3.10 – 4.36)	27.96 (26.76 – 29.31)
T5 (FSL)	38.36 (36.92 – 39.85)	11.56 (10.25 – 12.95)	21.06 (19.74 – 22.59)	8.55 (7.32 – 9.78)	33.91 (32.75 – 35.03)
BART (ZSL)	12.82 (11.68 – 13.97)	3.73 (3.27 – 4.20)	9.43 (8.76 – 10.12)	0.57 (0.44 – 0.74)	7.32 (5.43 – 9.41)
BART (FSL)	39.28 (38.10 – 40.46)	11.33 (10.37 – 12.44)	21.11 (20.27 – 22.02)	7.30 (6.49 – 8.11)	45.30 (44.24 – 46.33)
PEGASUS (ZSL)	25.69 (23.88 – 27.66)	5.70 (4.74 – 6.69)	16.72 (15.77 – 17.65)	3.31 (2.81 – 3.91)	75.56 (71.07 – 80.36)
PEGASUS (FSL)	38.96 (37.64 – 40.17)	10.44 (9.51 – 11.40)	21.92 (20.84 – 22.95)	7.00 (6.24 – 7.88)	43.59 (41.50 – 45.87)