Extrema Chisquared Test data4

x	y	dy1	dy2

 1.	29.5	6.5	1.0
 2.	26.9	4.1	1.0
 3.	24.9	3.5	1.0
 4.	23.5	2.8	1.0
 5.	23.2	2.5	1.0
 6	24.3	2.2	1.0
 7.	23.0	1.5	1.0
 8.	22.7	1.0	1.0
 9.	21.5	0.3	1.0
10. 	21.6	0.3	1.0
11.	21.65	0.2	1.0
12.	21.50	0.2	1.0