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The actual contents of the file can be viewed below.

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  105
  227  357
  175   43 4435
  669  823  538   10
  157 1745  768  400   10
  499  152 1055 3691   10 3122
  665  243  653  431  303  133  379
   66  715 1405  331  441 1269  162   19
  145  136  168   10  280   92  148   40   29
  197  203  113   10  396  286   82   20   66 1745
  236 4482 2430  412   48 3313 2629  263  305  345  218
  185  125   61   47  159  202  113   21   10 1772 1351  193
   68   53   97   22  726   10  145   25  127  454 1268   72  327
  490   87  173  170  285  323  185   28  152  117  219  302  100   43
 2440  385 2085  590 2331  396  568  691  303  216  516  868   93  487 1202
 1340  314 1393  266  576  241  369   92   32 1040  156  918  645  148  260 2151
   14  230   40   18  435   53   63   82   69   42  159   10   86  468   49   73   29
   56  323  754  281 1466  391  142   10 1971   89  189  247  215 2370   97  522   71  346
  968   92   83   75  592   54  200   91   25 4797  865  249  475  317  122  167  760   10  119

 0.0755 0.0621 0.0410 0.0371 0.0091 0.0382 0.0495 0.0838 0.0246 0.0806 0.1011 0.0504 0.0220 0.0506 0.0431 0.0622 0.0543 0.0181 0.0307 0.0660

 A   R   N   D   C   Q   E   G   H   I   L   K   M   F   P   S   T   W   Y   V
Ala Arg Asn Asp Cys Gln Glu Gly His Ile Leu Lys Met Phe Pro Ser Thr Trp Tyr Val

Symmetrical part of the rate matrix and aa frequencies, estimated for
plant chloroplast proteins, under the REVaa model.  The first part is
S_ij = S_ji, and the second part has the amino acid frequencies
(\pi_i).  The substitution rate from amino acid i to j is Q_ij =
S_ij*PI_j.  This is the cpREV model used in protml 2.3b6 (12/10/98),
described by

Adachi, J., P. J. Waddell, W. Martin, and M. Hasegawa. 2000. Plastid
genome phylogeny and a model of amino acid substitution for proteins
encoded by chloroplast DNA. Journal of Molecular Evolution 50:348-358.