[ccp4bb] How to get Imean/SIGImean from separated anomalous data?

[Edward A. Berry]

I want to work with an mmcif file that has I+,sigI+,I-,SigI-;
 in different columns for each reflection (no Imean).
cif2mtz gives those same columns in the output mtz, with or without ANOMALOUS 
keyword.
cif2mtz and truncate seem to need the anomalous data as separate reflections 
hkl and -h-k-l in order to calculate Imean or Fmean. What is the best way to do 
this?
Thanks,
eab