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		| Paper: | 
		Some Comments on the Design of Échelle Spectrographs Using R2 or R4 Gratings for Precise Radial Velocity Measurements | 
	 
	
		| Volume: | 
		185, Precise Stellar Radial Velocities, IAU Colloquium 170 | 
	 
	
		| Page: | 
		29 | 
	 
	
		| Authors: | 
		Hearnshaw, J.; Rumsey, N.; Nankivell, G. | 
	 
	
	
		| Abstract: | 
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