An array of TRTFRun structures, where each struct identifies a font style for a portion of text. 

For example, if you have: Value="Hello" RTFRuns={FirstChar:1 FontIndex=1, FirstChar=3, FontIndex=2} 

"H" (char 0) will be formatted with the specific cell format. "el" (chars 1 and 2) will have font number 1 "lo" (chars 3 and 4) will have font number 2

TRTFRunList = array of TRTFRun;

array of TRTFRun TRTFRunList;