Help Needed for "firdes.root_raised_cosine"

Dear all,

I am currently going through the tutorials of GNU Radio. Here I have doubts on "firdes.root_raised_cosine".

For example, in the "QPSK Mod and Demod" chapter, "firdes.root_raised_cosine" has been used where there are five types of data inside the bracket after "firdes.root_raised_cosine". What do these data fields mean?

Thanks in advance.

With regards,

Shuvodip