6 
NATIONAL GEOGRAPHIC SOCIETY, TECHNICAL PAPERS 
FIGURE 5-ENLARGED VIEW OF INSCRIPTION ON STELA “c” SHOWING BY SHADOW 
AT THE TOP THE POSITION OF DEFACED DOT OF THE KATUN COEFFICIENT 
AN INITIAL SERIES FROM TRES ZAPOTES 
7 
FIGURE 6-DETAIL OF THE KATUN COEFFICIENT SHOWING REMAINING PORTION OF 
CIRCULAR GROOVE (ON THE LEFT) OUTLINING DEFACED DOT 
