// ridge sigma from fit
// x y dy y+ y-
7.500000	0.509006	0.014457	0.295328	0.522255
22.500000	0.455838	0.029914	0.251126	0.507843
37.500000	0.732365	0.210807	1.094231	0.318286
52.500000	0.396562	0.122253	0.395169	0.397533
67.500000	0.743694	0.424168	0.610465	0.741668
82.500000	1.769501	0.584211	0.440912	0.226647