Preparation	1	2	3	4
Observation 1	14.8	14.6	12.7	14.2
Observation 2	14.8	15	11.6	14.4
Observation 3	14.7	14.9	12.4	14.4
Observation 4	14.8	14.8	12.7	12.2
Observation 5	14.9	14.7	12.1	11.7