[phenixbb] phenix autobuild and omit map

Hi, I have a loop that was improperly built when I ran autobuild. the density according to the Fobs-Fcalc maps is not that great. Someone told me that autobuild can use omit maps to build / rebuild the loops so you dont have to do it by hand. Looking at the manual, I found the command, but am a little confused. The model used is the entire model correct? the target.pdb is the chain or region that was not correctly built. For iterative building...how many cycles should I go for? phenix.autobuild data=w1.sca model=coords.pdb omit_box_pdb=target.pdb \ composite_omit_type=iterative_build_omit thanks Raj