Xregister Image Overlay Sub-menu ? Print help c Overlay the marked column of the reference image with the same column of the input image l Overlay the marked line of the reference image with the sname line of the input image x Overlay the marked column of the reference image with the x and y lagged column of the input image y Overlay the marked line of the reference image with the x and y lagged line of the input image v Overlay the marked column of the reference image with the x and y shifted column of the input image h Overlay the marked line of the reference image with the x and y shifted line of the input image q Quit Image Overlay Sub-menu Colon Commands :c [m] [n] Overlay the middle [mth] column of the reference image with the mth [nth] column of the input image :l [m] [n] Overlay the middle [mth] line of the reference image with the mth [nth] line of the input image :x [m] Overlay the middle [mth] column of the reference image with the x and y lagged column of the input image :y [m] Overlay the middle [mth] line of the reference image with the x and y lagged line of the input image :v [m] Overlay the middle [mth] column of the reference image with the x and y shifted column of the input image :h [m] Overlay the middle [mth] line of the reference image with the x and y shifted line of the input image