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		 1. Introduction
		
			- In the northern stratosphere: (e.g. Holton and Tan 1980) 
			
				- Colder, deeper vortex, stronger polar-night jet in the W 
				
- Opposite to the Holton-Tan Oscillation in the solar maximum 
			
 
- In the southern stratosphere: 
			
				- Large difference not in midwinter but in spring 
			
 
		
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