So if I had to address myself to the graphic-maker, I’d say: There’s nothing wrong with being an Historian, say, and I’d gladly recommend the field to any aspiring undergraduate–but only after I made them understand that it is exceedingly difficult to make it a full-time gig unless you are both unusually dedicated and tremendously gifted.

I think what it means is “For example.” But when I first read it, I was confused, because it looked too much like “excluding.”