Measure point	Times of connect and disconnect the high pressure air	
		1	2	3	4	5		Average thickness (m)
1		20	18	19	20	19		19.2
2		22	21	20	21	20		20.8
3		22	22	21	20	21		21.2
4		12	10	09	13	10		10. 8
5		9	10	10	11	10		10.0
