I have a seemingly trivial problem in specifying column labels in phenix.find_ncs. Following the manual, on entering labels as :  
phenix.find_ncs xx.pdb yy.mtz params.ncs.labin = "labin FP=F PHIB=PHI FOM=FOM"
, phenix returns the error :  'Sorry, cannot interpret the keyword: params.ncs.labin=labin FP=F PHIB=PHI FOM=FOM'. Any clues on what mistake I might be making will be greatly appreciated.