,-----------.  
 |class label|  
 | centered  |  
 | on several|  
 | lines     |  
 |           |  
 `-----------'  
        |       
        |       
,-------------. 
|class label  | 
| left-aligned| 
| on several  | 
| lines       | 
|             | 
`-------------' 
        |       
,--------------.
|class label   |
| right-aligned|
| on several   |
| lines        |
|              |
`--------------'
        |       
                
 ,-----------.  
 |centered   |  
 | on several|  
 | lines     |  
 |           |  
 `-----------'