[Graham Boak]

Primoz's comment was simply a statement of the inherent possibilities and does not require any kind of comment other than a simple recognition of fact.

If I may summarise: there is evidence for a number of different schemes - the two Do17 schemes are not the same as the two for Hs123. (One of them is.) Therefore it cannot be a matter of a dogmatic ruling from above "Thou shalt use this scheme A and this scheme B" on the use of two schemes only. That fact, and the terminology used on the copied Do17 colours, point back to the options and terminology of Merrick's charts. That so far no aircraft type has been found with more than two options in use does not render them totally invalid, just that more information needs to be discovered as to their use. Or, as seems likely in the case of the mirror schemes, otherwise.