[phenixbb] R-free rules

in the phenix.reflection_file_editor gui not sure i understand this: [x] Extend existing R-free array(s) ... [R-free flags generation] <--+ | | | | +-if this is checked, then do NOT check "Generate R-free flags" in here ... because "extend" is not the same as "generate", right? ... and thanks for the help before. -bryan