Which is why you should overshoot and crop the corners.
Very true, Slobodan. As a competent photographer I should have taken more shots so I could crop out any fuzzy corners which might become a problem if I were to print a 2 meter x 4 meter polyptych.
Thinking that I probably did take more shots of that particular scene, for stitching, I revisited my archives to check. Sure enough, I found that I had taken a couple of more shots to the right of the scene, which I hadn't included in my original stitch, probably because of the variability of the tourist activity in 3 of the shots, which I thought the stitching program might not handle well. As I'm sure you know, stitching is not ideal for scenes which are not static.
Attached is the full scene showing the group of tourists in just one of the shots. I cropped out the tourists in the other two images prior to stitching. The degree of overlap was sufficient to allow that.
I've also included a 100% crop of the group of tourists which is close to the lower edge, but some distance from the extreme corner. Resolution is still lacking, but probably good enough for a 24" x 40" print, from a reasonable viewing distance of course.