88 
c) point 113, of which the Y was wrongly recorded (a 100 meter mistake). 
d) point 130, which, for no obvious reason, had a difference larger than 
20 meters. 
As for the 30 points, which, after the block adjustment, showed large coordinate 
differences between adjacent sections: if not included in the above mentioned series of 
+5m- 
+5m- 
♦5mt- 
Fig. 1 c 
rejected points, the best coordinate set of the two has been used for the computation 
of the absolute precision. 
In the graph, the errors in all points observed (even in the points rejected by 
the President) have been shown. 
General remark: In our opinion, the poor identification of the check points 
has had a bad influence on the obtained absolute precision.