Quote: ... The brightest red was in the Huygenian region, but the color did extend to some degree away from that area.
and here is a quote from another post of yours #2005477
Quote: ... the parts of M42 which show reddish colors to me tend to be well *away* from central Huygenian region and the Trapezium rather than adjacent to them
From these descriptions I understand that the parts that really stimulates the cones (first quotation) are not the same that show reddish color (the second quotation). I mean that I understand that "some degree away" il less away that "well *away*".
So, are you meaning the same regions? And which exactly are these regions?