I guess you are watching the object-form --'D:\AVEVA\Plant\PDMS12.0.SP6\PMLLIB\paragon\objects\catspecviews.pmlobj'
in method initOpHeadings() you can see the answer
Your
heading
is the option gadget(opHeadings) that abtained values from some array(). This array() is collect from the tans of owne of owne of owne of spco..