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GrismAlpha - The angle of incidence of the incoming light on the grating surface

Description:
This attribute holds the angle between the incoming light and the normal to the grating surface, in radians. The default value is 0.
Type:
Double precision.
Class Applicability:
GrismMap
All GrismMaps have this attribute.


next up previous 264
Next: GrismEps - The angle between the normal and the dispersion plane
Up: AST Attribute Descriptions
Previous: Grid - Draw grid lines for a Plot?

AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 210
R.F. Warren-Smith & D.S. Berry
24th May 2011
E-mail:ussc@star.rl.ac.uk

Copyright (C) 2009 Science \& Technology Facilities Council