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[modeller_usage] Defining the centre of a helix and restraints



Hi All,
I have a small problem. I work on GPCRs and would like to use some electron crystallography data. However, the data given are distances between the centres of transmembrane alpha helices rather than a specific atom eg CA. Does anyone know how I would specify the centre of a helix when using distance restraints?. 
Many Thanks in advance 
John