EX model 
Summary statistics 
P_{c}: proportion of C in the training set; r_{c}: global rate of C; P_{C}/LG: correlation of C aminoacid frequencies compared to LG frequencies; R_{C}/LG: correlation of C and LG exchangeabilities using log values (exchangeabilities are highly contrasted with some very small values);Q_{C}/LG: correlation of C and LG rates using log values. 
Equilibrium aminoacid frequencies: P_{C} 
Exchangeability matrices: R_{C} 
C 
Buried 
Exposed 
0.448 
0.552 

0.557 
1.360 

0.673 
0.619 

0.934 
0.927 

0.915 
0.940 