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GrismG
-
The grating ruling density
- Description:
- This attribute holds the number of grating rulings per unit length.
The unit of length used should be consistent with the units used
for attributes GrismWaveR and GrismNRP. The default value is 0.0.
(the appropriate value for a pure prism disperser with no grating).
- Type:
- Double precision.
- Class Applicability:
-
GrismMap
-
All GrismMaps have this attribute.
Next: GrismM - The interference order
Up: AST Attribute Descriptions
Previous: GrismEps - The angle between the normal and the dispersion plane
AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 211
R.F. Warren-Smith & D.S. Berry
24th May 2011
E-mail:ussc@star.rl.ac.uk
Copyright (C) 2009 Science \& Technology Facilities Council