Data table for symetric interior loops of size 2
Free energies at 37 degrees for DNA
Data Arrangement:

            Y
    ------------------
(X)  A    C    G    T  
    ------------------
        5' --> 3'
            X
           A A
           U U
            Y
        3' <-- 5'
(A)  .    .    .    .   
(C)  .    .    .    .   
(G)  .    .    .    .   
(U)  .    .    .    .   


  
          Y                   Y                   Y                   Y                   Y                   Y
  ------------------  ------------------  ------------------  ------------------  ------------------  ------------------
   A    C    G    T    A    C    G    T    A    C    G    T    A    C    G    T    A    C    G    T    A    C    G    T  
  ------------------  ------------------  ------------------  ------------------  ------------------  ------------------
      5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'
          X                   X                   X                   X                   X                   X
         A A                 A C                 A G                 A T                 A G                 A T        
         T T                 T G                 T C                 T A                 T T                 T G        
          Y                   Y                   Y                   Y                   Y                   Y
      3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'
  1.7  1.7  1.7  1.7  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7    
  1.7  1.7  1.7  1.7  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7    
  1.7  1.7 -0.4  1.7  1.1  1.1 -1.0  1.1  1.1  1.1 -1.0  1.1  1.7  1.7 -0.4  1.7  1.7  1.7 -0.4  1.7  1.7  1.7 -0.4  1.7  
  1.7  1.7  1.7  1.5  1.1  1.1  1.1  1.0  1.1  1.1  1.1  1.1  1.7  1.7  1.7  1.2  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  
  
          Y                   Y                   Y                   Y                   Y                   Y
  ------------------  ------------------  ------------------  ------------------  ------------------  ------------------
   A    C    G    T    A    C    G    T    A    C    G    T    A    C    G    T    A    C    G    T    A    C    G    T  
  ------------------  ------------------  ------------------  ------------------  ------------------  ------------------
      5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'
          X                   X                   X                   X                   X                   X
         C A                 C C                 C G                 C T                 C G                 C T        
         G T                 G G                 G C                 G A                 G T                 G G        
          Y                   Y                   Y                   Y                   Y                   Y
      3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'
  1.1  1.1  1.1  1.1  0.4 -0.4  0.4  0.4  1.1  0.4  0.4  0.4  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  
  1.1  1.1  1.1  1.1  0.3  0.5  0.4  0.5  0.4  0.4  0.4  0.4  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  
  1.1  1.1 -1.0  1.1 -0.1  0.4 -1.7  0.4  0.4  0.4 -1.4  0.4  1.1  1.1 -1.0  1.1  1.1  1.1 -1.0  1.1  1.1  1.1 -1.0  1.1  
  1.1  1.1  1.1  1.1  0.4  0.0  0.4 -0.3  0.4  0.4  0.4  0.4  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  
  

          Y                   Y                   Y                   Y                   Y                   Y
  ------------------  ------------------  ------------------  ------------------  ------------------  ------------------
   A    C    G    T    A    C    G    T    A    C    G    T    A    C    G    T    A    C    G    T    A    C    G    T  
  ------------------  ------------------  ------------------  ------------------  ------------------  ------------------
      5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'
          X                   X                   X                   X                   X                   X
         G A                 G C                 G G                 G T                 G G                 G T        
         C T                 C G                 C C                 C A                 C T                 C G        
          Y                   Y                   Y                   Y                   Y                   Y
      3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'
  1.1  1.1  1.1  1.1  0.8  0.4  0.4  0.4  0.4  0.3 -0.1  0.4  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  
  1.1  1.1  1.1  1.1  0.4  0.4  0.4  0.4 -0.4  0.5  0.4  0.0  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  
  1.1  1.1 -1.0  1.1  0.4  0.4 -2.1  0.4  0.4  0.4 -1.7  0.4  1.1  1.1 -1.0  1.1  1.1  1.1 -1.0  1.1  1.1  1.1 -1.0  1.1  
  1.1  1.1  1.1  1.1  0.4  0.4  0.4 -0.7  0.4  0.5  0.4 -0.3  1.1  1.1  1.1  1.0  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  
  
          Y                   Y                   Y                   Y                   Y                   Y
  ------------------  ------------------  ------------------  ------------------  ------------------  ------------------
   A    C    G    T    A    C    G    T    A    C    G    T    A    C    G    T    A    C    G    T    A    C    G    T  
  ------------------  ------------------  ------------------  ------------------  ------------------  ------------------
      5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'
          X                   X                   X                   X                   X                   X
         T A                 T C                 T G                 T T                 T G                 T T        
         A T                 A G                 A C                 A A                 A T                 A G        
          Y                   Y                   Y                   Y                   Y                   Y
      3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'
  1.7  1.7  1.7  1.7  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7    
  1.7  1.7  1.7  1.7  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7    
  1.7  1.7 -0.4  1.7  1.1  1.1 -1.0  1.1  1.1  1.1 -1.0  1.1  1.7  1.7 -0.4  1.7  1.7  1.7 -0.4  1.7  1.7  1.7 -0.4  1.7  
  1.7  1.7  1.7  1.8  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.7  1.7  1.7  1.5  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  
  
          Y                   Y                   Y                   Y                   Y                   Y
  ------------------  ------------------  ------------------  ------------------  ------------------  ------------------
   A    C    G    U    A    C    G    U    A    C    G    U    A    C    G    U    A    C    G    U    A    C    G    U  
  ------------------  ------------------  ------------------  ------------------  ------------------  ------------------
      5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'
          X                   X                   X                   X                   X                   X
         G A                 G C                 G G                 G U                 G G                 G U        
         U U                 U G                 U C                 U A                 U U                 U G        
          Y                   Y                   Y                   Y                   Y                   Y
      3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'
  1.7  1.7  1.7  1.7  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  
  1.7  1.7  1.7  1.7  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  
  1.7  1.7 -0.4  1.7  1.1  1.1 -1.0  1.1  1.1  1.1 -1.0  1.1  1.7  1.7 -0.4  1.7  1.7  1.7 -0.4  1.7  1.7  1.7 -0.4  1.7  
  1.7  1.7  1.7  1.7  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  
  
          Y                   Y                   Y                   Y                   Y                   Y
  ------------------  ------------------  ------------------  ------------------  ------------------  ------------------
   A    C    G    U    A    C    G    U    A    C    G    U    A    C    G    U    A    C    G    U    A    C    G    U  
  ------------------  ------------------  ------------------  ------------------  ------------------  ------------------
      5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'           5' --> 3'
          X                   X                   X                   X                   X                   X
         U A                 U C                 U G                 U U                 U G                 U U        
         G U                 G G                 G C                 G A                 G U                 G G        
          Y                   Y                   Y                   Y                   Y                   Y
      3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'           3' <-- 5'
  1.7  1.7  1.7  1.7  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  
  1.7  1.7  1.7  1.7  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  
  1.7  1.7 -0.4  1.7  1.1  1.1 -1.0  1.1  1.1  1.1 -1.0  1.1  1.7  1.7 -0.4  1.7  1.7  1.7 -0.4  1.7  1.7  1.7 -0.4  1.7  
  1.7  1.7  1.7  1.7  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.1  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7  1.7