Should have taken a photo-). I'd guess some were maybe 2'-2'4". The ones I have in mind were about that on every side. Certainly the thought going into the decision is paramount. And no boulders in the immediate area leads to the greater possibility of being included, perhaps. The last few (6 boulders in center) that probably precipitated the comment, here
. Approaching, I expected more. They are also in a "tight" area between path and wall, crowding the symbol(s).
I like TSF - next visit maybe to try the last BG ('16?) for which I got the map from Ernst, I'll take a measure.