[ccp4bb]: Map averaging.

[Joao Barbosa <joao@bri.nrc.ca>]

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Dear all,

I am using overlapmap to average 2 maps. These are from different complexes and
have slight different cell parameters. I have managed to get the same number of
grid points, but it is still complaining about the difference in the number of
columns. 

MAP1
           Number of columns, rows, sections ...............  127   99  144
           Map mode ........................................    2
           Start and stop points on columns, rows, sections    98  224  -24  
74   -3  140
           Grid sampling on x, y, z ........................   80  160  240
           Cell dimensions .................................  55.33750 109.03750
157.93750  90.00000  90.00000  90.00000
           Fast, medium, slow axes .........................    Y    X    Z
           Minimum density .................................    -3.64217
           Maximum density .................................    12.58786
           Mean density ....................................    -0.03331
           Rms deviation from mean density .................     0.96359
           Space-group .....................................    1
           Number of titles ................................    1

MAP2
           Number of columns, rows, sections ...............  126   99  144
           Map mode ........................................    2
           Start and stop points on columns, rows, sections    98  223  -24  
74   -3  140
           Grid sampling on x, y, z ........................   80  160  240
           Cell dimensions .................................  55.25000 109.08750
157.93750  90.00000  90.00000  90.00000
           Fast, medium, slow axes .........................    Y    X    Z
           Minimum density .................................    -3.94151
           Maximum density .................................    12.20598
           Mean density ....................................    -0.03232
           Rms deviation from mean density .................     0.96465
           Space-group .....................................    1
           Number of titles ................................    1

     ***Last point of column does not match.***

By the way, this maps were calculated by CNS and converted to CCP4 format with
xdlmapman. Any help in solving this is much appreciated. Are there other ways of
averaging maps? I actually wanted to average 3 maps but from what I read,
overlapmap will handle only 2.

Thank you, joao.

-- 
Joao Alexandre R G Barbosa
National Research Council (NRC)
Biotechnology Research Institute (BRI)
6100 Royalmount Ave.
Montreal, Quebec, Canada
H4P 2R2

phone : (514) 496-6173
fax   : (514) 496-5143
e-mail: joao@bri.nrc.ca