Photospheric map at 11:57 UT, plotted with respect to (x,y) = 529,–278 taken in the 4000 Å continuum (left panel), along with co-aligned, logarithmically scaled maps of the red wing of Ca II K, Hα, and Ca II 8542 Å, respectively. A chain of peripheral umbral dots is indicated with the red arrow, while its imprints on the ribbon are indicated with the blue arrows. Green arrows indicate the location of a penumbral feature used to align all images. The offset between the red and blue arrows gives an indication of the height difference between each layer.