How do you calculate the BLEU score in Table 2 in your paper?

[liang8qi]

How do you calculate the BLEU score in Table 2 in your paper? What does the BLEU in Table 2 mean? Does BLEU mean bleu-1, bleu-2, bleu-3, bleu-4, or is it the result returned by the commond "perl multi-bleu.perl -lc ref.txt < gen"?