| +.uneval | R Documentation | 
aes() and aes_string()+.uneval is a helper function to allow adding aes and aes_string in ggplot2
## S3 method for class 'uneval' a + b
| a | first argument | 
| b | second argument | 
http://stackoverflow.com/questions/28777626/how-do-i-combine-aes-and-aes-string-options
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