http://www.mpia.de/COMBO/combo_index.html   (e.g. image)

y = ifelse(x[,5]<.45,1,0)
> table(y)
y
   0    1 
2672  766 



[,1] [,2]   [,3]      [,4]    [,5]  [,6]    [,7]      [,8]    [,9]   
"Nr" "Rmag" "ApDRmag" "mumax" "Mcz" "MCzml" "chi2red" "UjMAG" "BjMAG"
[,10]   [,11]   [,12]   [,13]   [,14]   [,15]   [,16]   [,17]     [,18]   
"VjMAG" "usMAG" "gsMAG" "rsMAG" "UbMAG" "BbMAG" "VnMAG" "S280MAG" "W420FE"
[,19]    [,20]    [,21]    [,22]    [,23]    [,24]    [,25]    [,26]   
"W462FE" "W485FD" "W518FE" "W571FS" "W604FE" "W646FD" "W696FE" "W753FE"
[,27]    [,28]    [,29]    [,30]   
"W815FS" "W856FD" "W914FD" "W914FE"