Pickering 3: Forget it in my 8". Its erased smooth and blank like it never existed.
Pickering 4: OK, now there's this lighter tone soft edged ellipse or smoothed bar. It is uniform in intensity throughout its length and no indication its anything more than a brighter anomalous ghosting of things unresolved.
Pickering 5: Now its interesting. Its got a flattened funnel or V shape and its unevenly bright. Seems narrower on a way than Pickering 4 if only because definition is beginning to edge out its forms better.
Pickering 6: Now its no long one unit of uneven contrast as the following spot appearing more defined is seen to be seperated. It has a higher albedo and more certain edges. The two spots preceding are still not seperated in this Picketing value and instead appear analogous to a Dawes double - merged and notched.
All details reported at 200x, 8" f/9.