They're kind of "trick" spectrums -- they're basically color wheels "unrolled" into a strip. Both the left and right edges appear red to trichromats (the 'normies').
The horizontal marks you made ... you laid them right on top of where trichromats perceive bright, highly-saturated green.
LOL! Its red on the left too??? So it's red blending to orange then yellow to green? Those mid sections with horizontal lines are yellow-ish tan to me.