[ccp4bb] rigidbody group in refmac5

[Qixu Cai]

Dear all,

When we are running the rigidbody refinement of refmac5, if we do not
assign the rigidbody group in CCP4i GUI, what's the default rigidbody group
in refmac5?

Is it a rigidbody for each chain?

Thanks a lot.