166 
The results of the computation of the indices M m , a 2 m and m 2 , are contained in 
table 3. In order to make the computation operations easier, we computed, at first, 
the mean square value M 2m of M and afterwards we derived the variance from the 
well-known relation cr 2 = — M 2 . 
m 2 m m 
Table N. 3 
TEST 
M m 
o m 
m A 
N. points > 
< 
X 
y 
z 
X 
y 
z 
X 
y 
z 
X 
y 
2 
1 
+ 1.7 
+ 0.5 
4.8 
,9 
4.0 
4.7 
14 
14 
3 
— 0.5 
+ 1.6 
4.0 
2.7 
4.1 
5.2 
5 
+ 0.3 
+ 2.0 
5.5 
7.5 
3.7 
4.1 
14 
18 
6 
— 0.2 
— 1.4 
2.8 
3.9 
4.0 
4.5 
8 
+ 4.4 
+ 5.0 
4.3 
5.2 
4.2 
3.9 
11 
15 
10 
+ 0.1 
— 0.9 
3.5 
3.7 
3.6 
4.3 
11 
— 2.0 
+ 4.8 
+ 0.2 
7.5 
6.5 
2.7 
6.1 
7.2 
2.4 
13 
— 1.6 
— 1.0 
+ 2.8 
2.6 
2.8 
2.6 
3.8 
3.6 
2.6 
13 
15 
14 
14 
+ 0.3 
+ 0.2 
+ 1.6 
4.9 
2.7 
6.9 
3.3 
3.7 
3.2 
12 
13 
9 
15 
+ 0.3 
— 0.6 
— 1.8 
3.8 
2.7 
2.6 
3.0 
2.7 
2.1 
9 
14 
13 
16 
— 0.2 
— 0.6 
+ 0.1 
1.5 
2.1 
3.3 
3.1 
3.1 
1.9 
12 
14 
12 
17 
— 1.1 
— 1.9 
+ 1.6 
4.4 
4.8 
5.6 
5.3 
4.8 
6.3 
11 
8 
12 
18 
— 1.7 
+ 1.7 
— 1.8 
7.5 
9.7 
7.3 
6.2 
11.0 
6.2 
13 
13 
11 
19 
— 2.0 
— 1.7 
— 0.3 
2.9 
2.7 
2.4 
5.1 
6.5 
3.4 
18 
13 
13 
20 
+ 3.0 
— 0.3 
+ 0.2 
4.3 
3.8 
3.8 
4.0 
3.8 
3.7 
11 
16 
13