From the attached the image, on the x-axis you can see the 4' rsrg and 5'rsrg.

I am looking forward to getting an explanation from you.

Dear Smith, hope this will lead you to the answer:

chevy:/net/chevy/raid1/afonine/sources % which fifig
fifig: aliased to libtbx.find_files -g
chevy:/net/chevy/raid1/afonine/sources % fifig rsrg
./cctbx_project/mmtbx/refinement/print_statistics.py: "realsrg" : "rsrg",
chevy:/net/chevy/raid1/afonine/sources %

All the best,
Pavel