For the red dots, see my comment below @hammock The red square region is an image artifact of the overlay process. If you check the paper linked, there's a le

For the red dots, see my comment below @hammock The red square region is an image artifact of the overlay process. If you check the paper linked, there's a legend in the original image, which was then copied over to the combined image. I also discuss the image combining process a bit in the same comment.