[ccp4bb] Question on sca file

[Smith Lee]

Dear All,
I have a sca file. Will you please tell me by which software or how I can know 
whether the sca file contains R-free tags? If not, by which software or how I 
can add the R-free tags? And how much of the reflections I add the R-free tags?
I am looking forward to getting your reply.
Smith