Hi everyone,

When I scale the data using Scala, I don't know differences between 
_diffrn_reflns.meanI_over_sigI_all        6.5475
_diffrn_reflns.meanI_over_sd_all         21.3013
in the statistics. I think that both "sigma" and "sd" have the same 
meaning--"standard deviation". By the way, in the file header of PDB's, what 
are the meanings of the numbers 5 and 1 in the row "HELIX", numbers 0, 1 and -1 
in the row "SHEET". And in the row "SHEET", what's the meaning of the last 6 
columns.
HELIX    1   1 THR A   35  ASP A   37  5                                   3    
HELIX    2   2 SER A   41  TYR A   46  1                                   6    
HELIX    3   3 GLU A   68  ALA A   82  1                                  15    
SHEET    1   C 6 GLU A 224  ARG A 232  0                                        
SHEET    2   C 6 ILE A 214  GLU A 221 -1  N  CYS A 217   O  ARG A 229           
SHEET    3   C 6 PHE A 183  VAL A 189 -1  N  PHE A 187   O  LEU A 218           
SHEET    4   C 6 VAL A 302  LEU A 309 -1  O  ILE A 306   N  LYS A 184           
SHEET    5   C 6 LYS A 254  HIS A 261 -1  N  ILE A 258   O  GLY A 305           
SHEET    6   C 6 GLU A 280  PRO A 288  1  O  ASP A 283   N  VAL A 257   
        

Thanks

Lu Yongzhi

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