Found the following hamletworks.org entries referring to line 45

View Immaterial Textual Note for 2
2 Enter Barnardo, and Francisco, two Centinels. [Bl]  

View Commentary Note for 44
44 Hora. Well, sit we downe,1.1.33

View Material Textual Note for 44
44 Hora. Well, sit we downe,1.1.33

View Commentary Note for 45
45 And let vs heare Barnardo speake of this. 451.1.34

View Material Textual Note for 45
45 And let vs heare Barnardo speake of this. 451.1.34