b ¡mJUNE_-96N JUNE_-_97N N3N JULY_-_96N JULY_-_97N N6N AUG_-_96N AUG_-_97N N9N SEP_-_96N SEP_-_97N N12N  3 5 1.8 2 3 3.0 2 2 1.5 2 2 1.9 2 4 1.7 2 1.9 1 1.1 2 3 1.8 2 3 1.9 2 5 1.4 1 2 0.9 2 3 1.9 2 2 1.4 2 4 1.1 2 3 1.0 2 3 2.3 2 3 1.7 2 3 1.9 2 4 1.2 2 3 2.1 2 3 1.1 2 5 1.2 1 2 1.0 3 2 1.9 3 3 1.0 2 3 1.5 1 3 1.4 2 3 1.7 2 4 1.8 1 4 1.3 1 3 1.8 3 3 1.9 2 4 1.5 2 3 1.5 1 3 1.5 3 3 2.4 2 4 1.5 2 3 1.6 2 5 3.2 2 3 1.7 3 4 1.8 2 3 1.6 1 3 2.2 2 4 1.8 2 3 1.3 3 1.4 1 2 2.0 2 5 1.3 2 3 1.8 2 3 1.4 2 3 2.1 6 1.4 4 2 2.5 3 2 1.2 2 2 1.7 2 4 1.4 3 3 3.5 3 3 1.4 2 2 2.1 2 1.4 3 3 3.3 2 5 1.6 2 2 1.4 2 4 1.5 4 2 2.2 3 3 1.8 2 3 1.2 3 5 1.6 3 2 2.0 3 3 1.9 2 4 1.0 4 4 1.7 2 2 1.7 2 3 1.7 2 4 1.4 2 4 1.8 2 2 1.8 3 3 1.6 2 3 1.1 2 4 1.5 2 2 2.2 3 4 1.7 1 3 1.2 2 5 1.8 2 6 1.7 2 3 2.3 2 4 1.7 2 4 1.8 2 5 1.6 2 2 2.3 3 3 2.2 2 4 1.8 2 5 1.4 2 2 2.1 4 1.4 2 3 1.7 3 4 2.3 2 1.6 3 3 1.8 2 4 1.5 3 5 4.6 2 2 1.9 3 3 1.4 2 4 1.5 3 4 5.0 2 1.5 2 4 2.9 2 3 1.5 2 5 3.4 2 2 1.4 2 3 1.5 2 3 1.4 2 5 2.4 2 2 1.1 2 3 1.6 2 4 2.1 2 4 2.3 2 2 1.5 2 3 1.6 2 4 1.7 2 2 1.8 2 2 1.6