#filename:	LETGbasic.rdb
#memo:	http://space.mit.edu/HETG/hess/basic.html
#
# This file is used to store/transfer LETG Calibration data.
#
#--------------------------------
# History information:
# created 8/4/97 dd
# 8/5/97 dd vignetting values updated based on frame dimensions
# 10/7/97 dd LETG version created with data from Theo
# 10/21/97 dd Add variables for the coarse/fine vignetting
# 10/22/97 dd tweak the coarse and fine values
# 1/21/98 dd mirror-area averaged vignetting is about:
# print, 0.402714*0.81 + 0.269681*0.84 + 0.212426*0.85 +  0.115180*0.88
#  = 0.8346
#--------------------------------
#
#.........Column definitions.....
# This rdb file lists several one-number
# products.  The rdb columns are therefore
# generic and self explanatory.
#
#.........Name definitions.......
# LETGrd      Design/built Rowland Diameter of LETG
# LETGrad1    Effective ring radius of LETG shell 1 gratings
# LETGrad3    Effective ring radius of LETG shell 3 gratings
# LETGrad4    Effective ring radius of LETG shell 4 gratings
# LETGrad6    Effective ring radius of LETG shell 6 gratings
# LETGvign1   LETG shell 1 vignetting factor
# LETGvign3   LETG shell 3 vignetting factor
# LETGvign4   LETG shell 4 vignetting factor
# LETGvign6   LETG shell 6 vignetting factor
# LETGvignAve LETG average vignetting factor
# LETGvigncoarse  Vignetting due to the coarse support structure
# LETGvignfine    Vignetting due to the fine support structure
#................................
#
NAME	VALUE	ERROR	UNIT
S	N	N	S
LETGrd	8633.69	0.1	mm
LETGrad1	521.66	0.1	mm
LETGrad3	419.90	0.1	mm
LETGrad4	370.66	0.1	mm
LETGrad6	275.44	0.1	mm
LETGvign1	0.81	0.01	none
LETGvign3	0.84	0.01	none
LETGvign4	0.85	0.01	none
LETGvign6	0.88	0.01	none
LETGvignAve	0.8346	0.02	none
LETGvigncoarse	0.81	0.01	none
LETGvignfine	0.809	0.01	none