19
 generated by VMD
 Al             4.5             4.5             4.5
 O              4.5             4.5         6.41689
 O          6.41689             4.5             4.5
 O              4.5         6.41689             4.5
 O              4.5             4.5         2.58311
 O          2.58311             4.5             4.5
 O              4.5         2.58311             4.5
 H              4.5         7.00483         3.70895
 H              4.5         7.00483         5.29105
 H          7.00483         3.70895             4.5
 H          7.00483         5.29105             4.5
 H          1.99517         5.29105             4.5
 H          1.99517         3.70895             4.5
 H              4.5         1.99517         3.70895
 H              4.5         1.99517         5.29105
 H          5.29105             4.5         1.99517
 H          3.70895             4.5         1.99517
 H          3.70895             4.5         7.00483
 H          5.29105             4.5         7.00483
