I added some more text and plots and a speculation part onto the Orion-KL webpage.
https://www.parac.eu/projectmk27-Orion-KL.htm+++++++++++++++++++++++++++++++++++++++++++
The Vlsr of Orion-Kl is 7.5km/s.
And now the speculative part.
If we take the star as reference to be 0 km/s, then we can calculate the peaks to be at velocities relative to the centre proto sun.
The clouds (e and f) close to the reference are the clouds moving slowly around the star, and in a Kepler solar system, these are the most distant rings.
The clouds with the highest velocities (a,b,i,j) circle close to the protostar.
Interesting and logical is also that the temperature of the close by clouds i and j are higher (140K) than the clouds f and e (110K and 80K) far away from the protosun.
As a comparison, the clouds b and j move at about 11km/s and that is in our solar system the speed of Saturn around the sun.
Peak b could be caused by a maser path passing through a warping rim of other rings.
Or it could be a Jupiter like gas orb sweeping up material between the rings, acting as a short for the maser light between the rings.
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Still have to do some writing up for Cep-A, Mon-R2, W44 and W51.
I thought I finished W49N, W3 and W75, but now knowing the triple water maser profile, I have to edit those also.
(yes,and spelling check)
Michiel