Table 6.  Atomic coordinates (Å x 104) and equivalent isotropic U(eq) and anisotropic displacement parameters (Å2 x 103)
for SL988 n.1. U(eq) is defined as one third of the trace of the orthogonalized Uij tensor. The anisotropic displacement
factor exponent takes the form:  -2 pi^2 0...0 


            x             y             z        U(eq)      U11        U22        U33        U23        U13        U12 

O(11)     3631(2)       3382(2)       1211(4)     8(1)      5(1)      10(1)       7(1)       0(1)       1(1)       1(1) 
O(12)     3613(2)       1780(2)       6481(4)     7(1)      4(1)       8(1)       9(1)       1(1)       1(1)       0(1) 
O(21)     6146(2)       5101(2)       3084(4)     8(1)     10(1)       6(1)       9(1)      -1(1)       3(1)      -1(1) 
O(22)     6062(2)       9976(2)       8046(4)    10(1)     12(1)       8(1)       9(1)       0(1)       2(1)       2(1) 
O(31)     6062(2)       2657(2)         50(4)     7(1)      5(1)      10(1)       6(1)      -2(1)       1(1)       0(1) 
O(32)     5979(2)       2409(2)       4985(3)     7(1)      7(1)       9(1)       5(1)       2(1)       1(1)      -1(1) 
Si(1)     5395(1)       3474(1)       2273(1)     5(1)      4(1)       5(1)       5(1)       0(1)       1(1)      -1(1) 
Si(2)     5376(1)       1628(1)       7310(1)     5(1)      4(1)       6(1)       4(1)       0(1)       1(1)       0(1) 
M11       2500          3480(1)       7500        5(1)      4(1)       6(1)       4(1)       0          1(1)       0 
M1        2500          1584(1)       2500        6(1)      6(1)       7(1)       5(1)       0          1(1)       0 
M2        2500          5515(1)       2500        9(1)     10(1)       8(1)       6(1)       0         -1(1)       0 
M21       2500          9509(1)       7500       11(1)     15(1)       7(1)       8(1)       0         -1(1)       0