TABLE 5.1: Average reading (2 times the conductivity ratio - uncalibrated) for each day for glass and plastic bottles and the resulting differences in salinity

Date	Glass bottle (average)	Plastic bottle (average)	Difference in salinity (1×10-3)
10/04/90	1.98424	1.98427	0.6
10/05/90	1.98423	1.98423	0.0
10/10/90	1.98428	1.98435	1.4
10/16/90	1.98433	1.98440	1.4
10/24/90	1.98443	1.98453	2.0
10/30/90	1.98448	1.98482	4.0
11/13/90	1.98455	1.98471	3.2