| mainTitle | R Documentation | 
Add a title to the current plot, in the title region. This function attempts to make the title as large as possible within the constraints of the title space allocated.
| titles | Vector of titles to put in the title space allocated on the page. First element is larger than the remainder | 
| mainfont | Font scaling applied to cex (default: NULL) | 
| shrinktofit | Shrink the font size automatically until the widest title line fits in the space allocated (default: TRUE) | 
| cex | Font scaling factor (multiplies the underlying panel "unit" font size) (default: NULL) | 
Matt Arnold
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