Update relational-data.Rmd (minor typo) (#641)
Row 371 : In table=`airports`, the variable representing longitude is not `long` ...it is `lon`
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						Hadley Wickham
					
				
			
			
				
	
			
			
			
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			@@ -368,7 +368,7 @@ So far, the pairs of tables have always been joined by a single variable, and th
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    variables from `x` will be used in the output.
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    For example, if we want to draw a map we need to combine the flights data
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    with the airports data which contains the location (`lat` and `long`) of
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    with the airports data which contains the location (`lat` and `lon`) of
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    each airport. Each flight has an origin and destination `airport`, so we
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    need to specify which one we want to join to:
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