data exptime/	0.11, 0.12, 0.14, 0.16, 0.18, 0.20, 0.23, 0.26,
		0.30, 0.35, 0.40, 0.50, 0.60, 0.70, 0.80,
		1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.3, 2.6,
		3.0, 3.5, 4.0, 5.0, 6.0, 7.0, 8.0,
		10., 12., 14., 16., 18., 20., 23., 26.,
		30., 35., 40., 50., 60., 70., 80.,
		100., 120., 140., 160., 180., 200., 230., 260.,
		300., 350., 400., 500., 600., 700., 800., 900.,
		1.0e3, 1.1e3, 1.2e3, 1.3e3, 1.4e3, 
		1.5e3, 1.6e3, 1.7e3, 1.8e3, 1.9e3, 
		2.0e3, 2.1e3, 2.2e3, 2.3e3, 2.4e3, 
		2.5e3, 2.6e3, 2.7e3, 2.8e3, 2.9e3, 
		3.0e3, 3.1e3, 3.2e3, 3.3e3, 3.4e3, 
		3.5e3, 3.6e3, 3.7e3, 3.8e3, 3.9e3, 
		4.0e3, 4.1e3, 4.2e3, 4.3e3, 4.4e3, 
		4.5e3, 4.6e3, 4.7e3, 4.8e3, 4.9e3, 
		5.0e3, 5.1e3, 5.2e3, 5.3e3, 5.4e3, 5.5e3, 5.6e3, 5.8e3, 
		6.0e3, 6.2e3, 6.4e3, 6.6e3, 6.8e3,
		7.0e3, 7.5e3, 8.0e3, 8.5e3, 9.0e3,
		1.0e4, 1.5e4, 2.0e4, 2.5e4, 3.0e4, 4.0e4, 5.0e4, 7.5e4, 1.0e5/